28 And we know that for those who love God all things work together for good, [*] for those who are called according to his purpose. 29 For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the firstborn among many brothers. 30 And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified.
[*] 8:28 Some manuscripts God works all things together for good, or God works in all things for the good
That's what God guarantees us in Romans 8:28-30. Even the crap of life works together for good for those who love God; it says all things work together for good, not some things. That's nice to know.