Charles H. Spurgeon on Psalms 119:71

That I might learn. As prosperity blindeth the eyes of men, even so doth adversity open them. Like as the salve that remedies the disease of the eyes doth first bite and grieve the eyes, and maketh them to water, but yet afterward the eyesight is clearer than it was; even so trouble doth vex men wonderfully at the first, but afterwards it lighteneth the eyes of the mind, that it is afterward more reasonable, wise and circumspect. For trouble bringeth experience, and experience bringeth wisdom. Otho Wermullerus, 1551.