Charles H. Spurgeon on Psalms 27:13

Under sore trouble and distress, labour to exercise a strong and lively faith. It was a noble and heroic resolution in that holy man Job, under his singular trials Job 13:15: "Though he slay me, yet will I trust in him; "as if he had said, Let my strokes be never so sore and heavy, yet I will not let go my grips of his word and promises, I will not raze these foundations of my hope. It was the way the psalmist kept himself from sinking under his heavy burdens: I had fainted, unless I had believed to see the goodness of the Lord in the land of the living. ...Faith brings new strength and auxiliary supplies of grace from heaven, when the former supply is exhausted and spent; whereof David had the sweet experience here. As God doth plant and actuate grace in the soul, so he is pleased to come in with seasonable supplies and reinforcements to the weak and decayed graces of his people, answerable to their present exigencies and pressures; and thus he doth from time to time feed the believer's lamp with fresh oil, give in more faith, more love, more hope, and more desires; and hereby he gives power to the faint, and strengthens the things which remain when ready to die. John Willison.