I was familiar with the first part of Donne’s Meditation 17, but I had forgotten this latter part of it:
Affliction is a treasure, and scarce any man hath enough of it. No man hath affliction enough that is not matured and ripened by it and made fit for God by that affliction. If a man carry treasure in bullion, or in a wedge of gold, and have none coined into current money, his treasure will not defray him as he travels. Tribulation is treasure in the nature of it, but it is not current money in the use of it, except we get nearer and nearer our home, heaven, by it. Another man may be sick too, and sick to death, and this affliction may lie in his bowels as gold in a mine and be of no use to him; but this bell that tells me of his affliction digs out and applies that gold to me, if by this consideration of another’s dangers I take mine own into contemplation and so secure myself by making my recourse to my God, who is our only security.