That I may cause those that love me to inherit substance,.... Substantial blessings, blessings indeed, as all spiritual ones are; and substantial grace, as every grace is; and substantial communion with God and Christ, which is a real thing, and had in the way of righteousness; also substantial happiness hereafter, as eternal life is; which being expressed by "substance", or "that which is" (g), as the word used signifies, denotes the reality of it; it being not only actually promised, prepared, and laid up for the saints, but is what is known by them now, and of which they have the earnest and pledge; as also the solidity of it, being opposed to the vain and shadowy things of this life; as well as the riches, valuableness, and continuance of it; it is enduring substance, which cannot be wasted nor taken away; which is in its own nature incorruptible, and the saints will always continue to enjoy it. God himself may be meant, who is most eminently that which is, a self-existent Being, and the Being of beings, essence itself, and of whom the saints are heirs, and who will be their portion now and for ever, Romans 8:17; and such that shall enjoy this inheritance are those that "love" Christ; to them it is promised, for them it is prepared, and to them it will be given, James 1:12, 1-Corinthians 2:9, not that their love to Christ is the meritorious cause of so valuable a blessing; but this describes the persons that shall have it, and points out a proper disposition for it, without which none would be fit to enjoy it; and besides there is a connection between grace and glory; to which may be added, that this shows that Christ does not love in word only, saying, "I love them that love me", Proverbs 8:17; but in deed also; and how much he esteems the love of his people; and it is designed to encourage the faith and hope of weak believers, who, though they do not so strongly believe in Christ, yet truly love him. And be it further observed, that this substance is enjoyed by way of inheritance; it is not purchased, nor acquired, but bequeathed and given to the children of God by their heavenly Father, and comes to them through the death of Christ the testator, and is for ever, as inheritances are; and so Aben Ezra observes, that it signifies an eternal possession;
and I will fill their treasures; the treasures of their hearts, Matthew 12:35; Christ now fills their understandings with spiritual knowledge, their souls with grace, their minds with peace and joy, and their hearts with food and gladness; and hereafter he will fill them to full satisfaction with knowledge, holiness, and joy, and will be all in all to them.
(g) "quod est", Junius & Tremellius; "rem solido vereque subsistentem", Gejerus; "solidum illud", Schultens.

Substance - Substantial happiness: opposed to all worldly enjoyments, which are but mere shadows.