Augustine of Hippo

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(Tract. xxxiv. s. 5) He withdraws you however from the eyes of the flesh, to those of the heart, in that He adds, He that followeth Me shall not walk in darkness, but shall have the light of life. He thinks it not enough to say, shall have light, but adds, of life. These words of our Lord agree with those of the Psalm, In Thy light shall we see light; for with Thee is the well of life. (Ps. 35) For bodily uses, light is one thing, and a well another; and a well ministers to the mouth, light to the eyes. With God the light and the well are the same. He who shines upon thee, that thou mayest see Him, the Same flows unto thee, that thou mayest drink Him. What He promises is put in the future tense; what we ought to do in the present. He that followeth Me, He says, shall have; i. e. by faith now, in sight hereafter. The visible sun accompanieth thee, only if thou goest westward, whither it goeth also; and even if thou follow it, it will forsake thee, at its setting. Thy God is every where wholly; He will not fall from thee, if thou fall not from Him. Darkness is to be feared, not that of the eyes, but that of the mind; and if of the eyes, of the inner not the outer eyes; not those by which white and black, but those by which just and unjust, are discerned.