Charles H. Spurgeon on Psalms 90:12

So teach us, etc. Moses sends you to God for teaching. "Teach Thou us; not as the world teacheth —teach Thou us." No meaner Master; no inferior school; not Moses himself except as he speaks God's word and becomes the schoolmaster to bring us to Christ; not the prophets, not apostles themselves, neither "holy men of old", except as they "spake and were moved by the Holy Ghost." This knowledge comes not from flesh and blood, but from God. "So teach Thou us." And so David says, "Teach me Thy way, O Lord, and I will walk in Thy truth." And hence our Lord's promise to his disciples, "The Holy Ghost, He shall teach you all things." —Charles Richard Summer, 1850.