Charles H. Spurgeon on Psalms 90:12

Teach us to number our days. Mark what it is which Moses here prays for, only to be taught to number his days. But did he not do this already? Was it not his daily work this, his constant and continual employment? Yes, doubtless it was; yea, and he did it carefully and conscientiously too. But yet he thought he did it not well enough, and therefore prays here in the text to be taught to do better. See a good man, how little he pleaseth himself in any action of his life, in any performance of duty that he does. He can never think that he does well enough whatever he does, but still desires to do otherwise, and would fain do better. There is an affection of modesty and humility which still accompanies real piety, and every pious man is an humble, modest man, and never reckons himself a perfect proficient, or to be advanced above a teaching, but is content and covetous to be a continual learner; to know more than he knows and to do better than he does; yea, and thinks it no disparagement to his graces at all to take advice, and to seek instruction where it is to be had. —Edm. Barker's Funeral Sermon for Lady Capell, 1661.