I used to, when I was still a Christian, like Reinhold Niebuhr's so-called Serenity Prayer very much, particularly the following lines:
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.
When I look at these lines again now, I can't help wondering why I thought I needed God in order to have the attitudes advocated in these lines. Why can't I develop the serenity, courage, and wisdom on my own? It may still work without God.