Bhagavad Gita Chapter 6. Verse 5

uddhared ātmanātmānaḿ nātmānam avasādayet
ātmaiva hy ātmano bandhur ātmaiva ripur ātmanaḥ

Raise yourself by yourself, do not let down yourself by yourself, it is the self that gives respect to the self and it is the self that deceives the self. Your Self is your friend. Your Self is your enemy. It is you who need to decide whether to raise yourself, or let yourself down.