Whenever you are torn by doubt or pain, pick up James Allen’s ‘As a Man Thinketh’.
It’ll remind you why you do the things you do. It cautions you to choose the path that suits you. It encourages you to pursue inner peace over purely material gain.
Evil is the thought that thinks it;
Good, the thought that makes it so
Light and darkness, sin and pureness
Likewise out of thinking grow.
Dwell in thought upon the Grandest,
And the Grandest you shall see;
Fix your mind upon the Highest,
And the Highest you shall be.James Allen, As a Man Thinketh
A word of caution. Remember that this book was originally published in 1903. So, you may not agree with every detail. But it is the essence that counts.