This is paragraph one from the chapter entitled "Eleventh Letter" from in this book. This book was written or dictated about 1700 perhaps a bit later on in 1700's. The book originally appeared in French. The differences in writing style and grammar construction make it difficult to read compared to today's customs. However, read and read again. Perhaps you will be blessed as have many others. You can download the book from Gutenberg.org
"I do not pray that you may be delivered from your pains, but I pray GOD earnestly that He would give you strength and patience to bear them as long as He pleases. Comfort yourself with Him who holds you fastened to the cross. He will loose you when He thinks fit. Happy those who suffer with Him: accustom yourself to suffer in that manner, and seek from Him the strength to endure as much, and as long, as He shall judge to be necessary for you. The men of the world do not comprehend these truths, nor is it to be wondered at, since they suffer like what they are, and not like Christians. They consider sickness as a pain to nature, and not as a favor from GOD; and seeing it only in that light, they find nothing in it but grief and distress. But those who consider sickness as coming from the hand of GOD, as the effect of His mercy, and the means which He employs for their salvation—such, commonly find in it great sweetness and sensible consolation."
Brother of the Resurrection Lawrence. The Practice of the Presence of God the Best Rule of a Holy Life.