Cast not away, therefore, etc. He shows what especially makes us strong to persevere, even the retaining of confidence; for when that is lost, we lose the recompense set before us. It hence appears that confidence is the foundation of a godly and holy life. By mentioning reward, he diminishes nothing from the gratuitous promise of Salvation; for the faithful know that their labor is not vain in the Lord in such a way that they still rest on God's mercy alone. But it has been often stated elsewhere how reward is not incompatible with the gratuitous imputation of righteousness.

Cast not away therefore your confidence - Greek "your boldness;" referring to their confident hope in God. They were not to cast this away, and to become timid, disheartened, and discouraged. They were to bear up manfully under all their trials, and to maintain a steadfast adherence to God and to his cause. The command is not to "cast this away." Nothing could take it from them if they trusted in God, and it could be lost only by their own neglect or imprudence. Rosenmuller supposes (Alte und Neue Morgenland, "in loc.") that there may be an allusion here to the disgrace which was attached to the act of a warrior if he cast away his shield. Among the Greeks this was a crime which was punishable with death. Alexander ab Alexand. Genesis. Dier. L. ii c. 13. Among the ancient Germans, Tacitus says, that to lose the shield in battle was regarded as the deepest dishonor, and that those who were guilty of it were not allowed to be present at the sacrifices or in the assembly of the people. Many, says he, who had suffered this calamity, closed their own lives with the baiter under the loss of honor. Tac. Germ. c. 6. A similar disgrace would attend the Christian soldier if he should cast away his shield of faith; compare the notes, Ephesians 6:16.
Which hath great recompense of reward - It will furnish a reward by the peace of mind which it gives here, and will be connected with the rewards of heaven.

Cast not away therefore your confidence - Την παρῥησιαν ὑμων· Your liberty of access to God; your title and right to approach his throne; your birthright as his sons and daughters; and the clear evidence you have of his favor, which, if you be not steady and faithful, you must lose. Do not throw it away, μη αποβαλητε· neither men nor devils can take it from you, and God will never deprive you of it if you continue faithful. There is a reference here to cowardly soldiers, who throw away their shields, and run away from the battle. This is your shield, your faith in Christ, which gives you the knowledge of salvation; keep it, and it will keep you.
The Lacedemonian women, when they presented the shields to their sons going to battle, were accustomed to say: Η ταν, η επι τας· "Either bring this back, or be brought back upon it;" alluding to the custom of bringing back a slain soldier on his own shield, a proof that he had preserved it to the last, and had been faithful to his country. They were accustomed also to excite their courage by delivering to them their fathers' shields with the following short address. Ταυτην ὁ πατηρ σοι αει εσωζε· και συ ουν ταυταν σωζε, η μη εσο· "This shield thy father always preserved; do thou preserve it also, or perish;" Lacaenarum Apophthegmata, Plut. Opera, a Wittenbach, vol. i. p. 682. Thus spake the Lacedemonian mothers to their sons; and what say the oracles of God to us? Μη αποβαλητε την παρῥησιαν ὑμων· Cast not away your confession of faith. This is your shield; keep it, and it will ever be your sure defense; for by it you will quench every fiery dart of the wicked one. The Church of Christ speaks this to all her sons, and especially to those employed in the work of the ministry. Of this shield, of this glorious system of salvation by Jesus Christ, illustrated and defended in this work, I say to each of my children: Ταυτην ὁ πατηρ σοι αει εσωζε· και συ ουν ταυταν σωζε, η μη εσο· This faith, thy father, by the grace of God, hath always kept; keep thou it also, or thou must expect to perish! May this be received both as a warning and encouragement!
Great recompense of reward - No less than God's continual approbation; the peace that passeth all understanding ruling the heart here; and the glories of heaven as an eternal portion. Conscientiously keep the shield, and all these shall be thine. This will be thy reward; but remember that it is the mercy of God that gives it.

Cast not away therefore your confidence,.... The same word is used here, as in Hebrews 10:19 where it is translated "boldness"; and may design here, as there, an holy boldness in prayer, free from a servile and bashful spirit; and which appears in a liberty of speaking to God, and in a confidence of being heard; prayer itself should not be left off, nor should freedom, boldness, and confidence in it be slackened, or laid aside: or else a profession of faith is intended, which ought to be free and open, bold and courageous, firm and constant; and which ought by no means to be let go and dropped: or the grace of faith in its full assurance, with respect to interest in God, as a covenant God and Father, and in his love; and with respect to interest in Christ, and in his grace, and a right to the glorious inheritance, the better and enduring substance: and this shield of faith is by no means to be cast away; it was reckoned infamous and scandalous in soldiers to lose or cast away their shield; with the Grecians it was a capital crime, and punished with death (b); to which the apostle may here allude. There are two sorts of believers, nominal and real; and there are two sorts of faith; an historical one, which may be in persons destitute of the grace of God, and is in devils; and a true and unfeigned one, which has salvation connected with it; the former may be cast away and lost; the latter, though it may be remiss and weak in its exercise, yet it cannot be wholly and finally lost; and this exhortation may be designed as a means of continuing it, and of perseverance in it: the reason urging it follows,
which hath great recompence of reward; freedom and boldness in prayer has its reward, for such that ask in faith shall have; and so has a firm and constant profession of religion, for he that endures to the end shall be saved; and so has a true and strong faith in Christ; everlasting salvation is connected with it; the reward of the inheritance follows upon it; and this reward is the recompense of God's own grace: and it is a very great one; it is the fruit of great love and grace; yea, it is no other than God himself, who is the exceeding great reward of his people; it is Christ and his glory, and the riches of it; it is a reward exceeding, and beyond all deserts of men, and beyond all thought and expression.
(b) Alex. ab. Alexand. Genial. Dier. l. 2. c. 13.

Consequent exhortation to confidence and endurance, as Christ is soon coming.
Cast not away--implying that they now have "confidence," and that it will not withdraw of itself, unless they "cast it away" wilfully (compare Hebrews 3:14).
which--Greek, "the which": inasmuch as being such as.
hath--present tense: it is as certain as if you had it in your hand (Hebrews 10:37). It hath in reversion.
recompense of reward--of grace not of debt: a reward of a kind which no mercenary self-seeker would seek: holiness will be its own reward; self-devoting unselfishness for Christ's sake will be its own rich recompense (see on Hebrews 2:2; Hebrews 11:26).

Cast not away therefore this your confidence - Your faith and hope; which none can deprive you of but yourselves.