We know that perseverance in prayer is a rare and difficult attainment; and it is a manifestation of our unbelief that, when our first prayers are not successful, we immediately throw away not only hope, but all the ardor of prayer. But it is an undoubted evidence of our Faith, if we are disappointed of our wish, and yet do not lose courage. Most properly, therefore, does Christ recommend to his disciples to persevere in praying. The parable which he employs, though apparently harsh, was admirably fitted to instruct his disciples, that they ought to be importunate in their prayers to God the Father, till they at length draw from him what He would otherwise appear to be unwilling to give. Not that by our prayers we gain a victory over God, and bend him slowly and reluctantly to compassion, but because the actual facts do not all at once make it evident that he graciously listens to our prayers. In the parable Christ describes to us a widow, who obtained what she wanted from an unjust and cruel judge, because she did not cease to make earnest demands. The leading truth conveyed is, that God does not all at once grant assistance to his people, because he chooses to be, as it were, wearied out by prayers; and that, however wretched and despicable may be the condition of those who pray to him, yet if they do not desist from the uninterrupted exercise of prayer, he will at length regard them and relieve their necessities. The parties between whom the comparison is drawn are, indeed, by no means equal; for there is a wide difference between a wicked and cruel man and God, who is naturally inclined to mercy. But Christ intended to assure believers that they have no reason to fear lest their persevering entreaties to the Father of mercy should be refused, since by importunate supplication they prevail on men who are given to cruelty. The wicked and iron-hearted judge could not avoid yielding at length, though reluctantly, to the earnest solicitations of the widow: how then shall the prayers of believers, when perseveringly maintained, be without effect? If exhaustion and weakness are felt by us when we give way after a slight exertion, or if the ardor of prayer languishes because God appears to lend a deaf ear, let us rest assured of our ultimate success, though it may not be immediately apparent. Entertaining this conviction, let us contend against our impatience, so that the long delay may not induce us to discontinue our prayers.

A parable - See the notes at Matthew 13:3.
To this end - To show this.
Always - At all times. That is, we must not neglect regular stated seasons of prayer; we must seize on occasions of remarkable providences as afflictions or signal blessings to seek God in prayer; we must "always" maintain a spirit of prayer, or be in a proper frame to lift up our hearts to God for his blessing, and we must not grow weary though our prayer seems not to be answered.
Not to faint - Not to grow weary or give over. The parable is designed to teach us that, though our prayers should long appear to be unanswered, we should persevere, and not grow weary in supplication to God.

Men ought always to pray - Therefore the plain meaning and moral of the parable are evident; viz. that as afflictions and desolations were coming on the land, and they should have need of much patience and continual fortitude, and the constant influence and protection of the Almighty, therefore they should be instant in prayer. It states, farther, that men should never cease praying for that the necessity of which God has given them to feel, till they receive a full answer to their prayers. No other meaning need be searched for in this parable: St. Luke, who perfectly knew his Master's meaning, has explained it as above.

And (1) he spake a parable unto them [to this end], that men ought always to pray, and not to (a) faint;
(1) God will have us to continue in prayer, not to weary us, but to exercise us; therefore we must fight against impatience so that a long delay does not cause us to quit our praying.
(a) Yield to afflictions and adversities as those do who have lost heart.

And he spoke a parable unto them,.... To his own disciples, as the Ethiopic version reads, in order to encourage them to prayer, with perseverance in it; since such sore times of trial and affliction were coming upon the Jews, of which he had spoken in the preceding chapter; and such times more especially call for prayer; see Psalm 50:15
to this end, that men ought always to pray. This is opposed to them, who pray not at all, or have left off prayer before God, or who pray only in distress; and suggests, that a man should pray as often as he has an opportunity; should be constant and assiduous at the throne of grace, and continue putting up his requests to God, though he does not presently return an answer:
and not to faint; by reason of afflictions, temptations, desertions, and delays in answering prayer; and prayer itself is an admirable antidote against fainting under afflictive providences: it is with the Jews an affirmative precept that a man should pray, , "every day" (k); it was usual with them to pray three times a day; see Psalm 55:17 there is no set time fixed by Christ; men should be always praying. This is not to be understood, that a man should be always actually engaged in the work of prayer; that he should be continually either in his closet, in private devotion to God, or attending exercises of more public prayer, with the saints; for there are other religious exercises to be performed, besides prayer; and besides, there are many civil affairs of life, it is every man's indispensable duty to regard: nor does our Lord mean in the least to break in upon, or interrupt the natural and civil duties of life; but his meaning is, that a man should persevere in prayer, and not leave off, or be dejected, because he has not an immediate answer; and this is clear from the following case.
(k) Maimon. Hilch. Tephilla, c. 1. sect. 1.

All God's people are praying people. Here earnest steadiness in prayer for spiritual mercies is taught. The widow's earnestness prevailed even with the unjust judge: she might fear lest it should set him more against her; but our earnest prayer is pleasing to our God. Even to the end there will still be ground for the same complaint of weakness of faith.

PARABLE OF THE IMPORTUNATE WIDOW. (Luke 18:1-8)
always--Compare Luke 18:7, "night and day."
faint--lose heart, or slacken.

They ought always to pray. Prayer is a privilege and a duty.
Not to faint. Persistence in prayer is requisite to making it effectual. See Ephesians 6:18. "God reserves for thee that which he is slow to give thee, that thou mayest learn to entertain a supreme desire and longing for it."--Augustine.

He spake a parable to them - This and the following parable warn us against two fatal extremes, with regard to prayer: the former against faintness and weariness, the latter against self confidence.