Two quotes that I try to keep in mind. The first is longish but it touches me incredibly deeply and has gotten me through some pretty rough times. The second just really resonates strongly with me.
“And now I give you a commandment which shall be for a covenant between you and Me—that ye have faith; that your faith be steadfast as a rock that no storms can move, that nothing can disturb, and that it endure through all things even to the end; even should ye hear that your Lord has been crucified, be not shaken in your faith; for I am with you always, whether living or dead, I am with you to the end. As ye have faith so shall your powers and blessings be. This is the balance—this is the balance—this is the balance.”
Abdul Baha (Adib Taherzadeh, The Revelation of Baha’u’llah v 4, p. 217)
“I did then what I knew how to do. Now that I know better, I do better.” -Maya Angelou