" Those whom [the Lord] teaches, are always increasing in knowledge, both of themselves and of him. The heart is deep, and, like Ezekiel's vision, presents so many chambers of imagery, one within another, that it requires time to get a considerable acquaintance with it, and we shall never know it thoroughly. It is now more than twenty-eight years since the Lord began to open mine to my own view; and from that time to this, almost every day has discovered to me something which until then was unobserved; and the farther I go, the more I seem convinced that I have entered but a little way. A person who travels in some parts of Derbyshire may easily be satisfied that the country is cavernous; but how large, how deep, how numerous the caverns may be, which are hidden from us by the surface of the ground, and what is contained in them—are questions which our most discerning inquirers cannot fully answer…
And if our own hearts are beyond our comprehension, how much more incomprehensible is the heart of Jesus! If sin abounds in us—grace and love superabound in him! His ways and thoughts are higher than ours, as the heavens are higher than the earth; his love has a height, and depth, and length, and breadth, which passes all knowledge! The riches of his grace are unsearchable riches! Eph. 3:8, Eph. 3:18, Eph. 3:19. All that we have received or can receive from him, or know of him in this life, compared with what he is in himself, or what he has for us—is but as the drop of a bucket—compared with the ocean; or a single ray of light—compared with the sun. The waters of the sanctuary flow to us at first almost ankle deep—so graciously does the Lord condescend to our weakness; but they rise as we advance, and constrain us to cry out, with the Apostle, O the depth! We find before us, as Dr. Watts beautifully expresses it,
A sea of love and grace unknown,
Without a bottom or a shore! "

― John Newton