No chastening for the present seemeth to be joyous, but grievous; nevertheless afterward it yieldeth the peaceable fruit of righteousness unto them which are exercised thereby. Hebrews 12:11
My son, despise not the chastening of the Lord ... for whom the Lord loveth, he chasteneth, and scourgeth every son whom he receiveth. Hebrews 12: 5-6
Though he were a son, yet learned he obedience by the things which he suffered; and having been made perfect, he became the author of eternal salvation unto all them that obey him. Hebrews 5:8-9.
It is easy to claim that Hebrews is the only book written by Paul. After all, it is a complex midrash and Paul claims to have had a classic mainline Jewish education. Hebrews is exactly the book you would expect from someone who has described his life story the way Paul does.
It is also easy, perhaps, to take Hebrews too far. To see all trials as gifts from God that make us perfect, rather than as reflects of an imperfect world, and to see Christ as "having been made perfect" (in the sense of "complete" or "finished" or even "perfect") by his suffering.
But there is some wisdom there, a sense of perspective and of warning, that takes me beyond what I know and cautions me to have hope, and patience and to remember in all things I can find God's love.