2 Corinthians 12:5-10

12:5 On behalf of such an individual I will boast, but on my own behalf I will not boast, except about my weaknesses. 12:6 For even if I wish to boast, I will not be a fool, for I would be telling the truth, but I refrain from this so that no one may regard me beyond what he sees in me or what he hears from me, 12:7 even because of the extraordinary character of the revelations. Therefore, so that I would not become arrogant, a thorn in the flesh was given to me, a messenger of Satan to trouble me – so that I would not become arrogant. 12:8 I asked the Lord three times about this, that it would depart from me. 12:9 But he said to me, “My grace is enough for you, for my power is made perfect in weakness.” So then, I will boast most gladly about my weaknesses, so that the power of Christ may reside in me. 12:10 Therefore I am content with weaknesses, with insults, with troubles, with persecutions and difficulties for the sake of Christ, for whenever I am weak, then I am strong.

Colossians 1:24

1:24 Now I rejoice in my sufferings for you, and I fill up in my physical body – for the sake of his body, the church – what is lacking in the sufferings of Christ.