It's kind of common knowledge that Artist's who go through turmoil channel it into their art and it usually makes it better.
Nas probably knows better than anyone, three of his albums which are strongly considered classics all came from personal turmoil.
Illmatic- Watched his best friend and little brother shot. Held Ill Will in his arms as he bled out. Saw countless friends be locked up, watched crack desimate his community, didn't even think he'd live to see 25.
Stillmatic- Mother dying of Cancer, his greatest adversary sleeping with the mother of his child, endured slander and the attempt to rewrite history and say his catalogue was "garbage".
Life Is Good- Public divorce. Child Support. Ailimony. A newborn Son he couldn't even see. The tax issues. His daughter growing up before him and becoming a woman.