You are probably familiar with the Serenity Prayer: 
“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.”
This prayer, written in the early 1930s by theologian Reinhold Niebuhr, contains deep wisdom.

Don’t believe in God? No problem. Just take out “God grant me” and replace with “I embody” and it becomes a powerful affirmation.
It’s the sentiment that’s important here.

It’s pointless to waste energy struggling against things that are out of your control, but it’s equally pointless to sit around and do nothing about things you can change.

Unfortunately – this is why it’s a prayer – this advice can be easier said than done.