The Puritans: From John Newton

On why Christians suffer:

Again, how could we, without sufferings, manifest the nature and truth of Gospel-grace! What place should we then have for patience, submission, meekness, forbearance, and a readiness to forgive, if we had nothing to try us, either from the hand of the Lord, or from the hand of men! A Christian without trials would be like a mill without wind or water; the contrivance and design of the wheel-work within would be unnoticed and unknown, without something to put it in motion from without. Nor would our graces grow, unless they were called out to exercise; the difficulties we meet with not only prove, but strengthen, the graces of the spirit. If a person were always to sit still, without making use of legs or arms, he would probably wholly lose the power of moving his limbs at last; but by walking and working he becomes strong and active. So, in a long course of ease, the powers of the new man would certainly languish; the soul would grow soft, indolent, cowardly, and faint; and therefore the Lord appoints His children such dispensations as make them strive and struggle, and pant; they must press through a crowd, swim against a stream, endure hardships, run, wrestle, and fight; and thus their strength grows in the using.

---John Newton, THREE LETTERS TO MRS H---, LETTER I: The School of Suffering