This is a quote I use for everything, including love, it is very well known, I love this quote so much and has helped me so much I have it tattooed on me.
God grant me the serenity
to accept the things I cannot change;
courage to change the things I can;
and wisdom to know the difference…
Some stuff (people) just will not ever change, some stuff (people) can change but you just gotta have courage to change it… Most importantly you gotta be able and have the wisdom to know which can and which can’t.