>>846696
A saint(forgot who) suffered terrible sexual temptations so he prayed to God so He'd free him from that but God answered: "If i take those away i'll have to give you something else" (like disease, persecution, other kind of temptation, etc).
Similarly with Paul:
"So to keep me from becoming conceited, I was given a thorn in my flesh, a messenger of Satan, to torment me. Three times I pleaded with the Lord to take it away from me. But he said to me, "My grace is sufficient for you, for my power is made perfect in weakness." Therefore I will boast all the more gladly about my weaknesses, so that Christ's power may rest on me.
(…) Now I rejoice in my sufferings for your sake, and in my flesh I am filling up what is lacking in Christ’s afflictions for the sake of his body, that is, the church"
So in suffering we get graces, it has redemptive power and we can unite it with Christ's perfect sacrifice. And it that last verse what it lacks is not merits because Christ's sacrifice is perfect, it only lacks our participation.
So carry your cross, live with your temptations without falling to them, in triumphing those battles you'll attain your sanctification. There is no cross God gives us that we cant bear and if we bear it with love for God it becomes light: "Take My yoke upon you and learn from Me; for I am gentle and humble in heart, and you will find rest for your souls. 30For My yoke is easy and My burden is light."
We can see this with the good and bad thief, one accepts his cross, his yoke became easier and in that same day he met the Lord in heaven, the other blasphemed, resented, insulted, his yoke got heavier and heavier.
St.Jean Vianney beautiful text on suffering:
https://thecatholicreader.blogspot.com/2013/01/catechism-on-suffering.html