We are accustomed to say that if a child takes a cupful from the sea it is just as full as before, but that is not literally true—there must be just so much the less of water in the ocean. But it is literally true of Christ, that when we have not only taken out cups full—for our needs are too great to be satisfied with such small quantities—when we have taken out oceans full of Divine Grace—and we need as much as that to carry us to Heaven—there is actually as much left!

Although we each have drawn upon the treasury of His love to an extent so boundless that we cannot understand it, yet there is as much mercy and Divine Grace left in Christ as there was before. And it is a “fullness,” still, after all the saints have received of it.

Charles Spurgeon
The Fullness of Jesus the Treasury of Saints