The key to remaining gaslight-free is not to let your self-worth depend on someone else’s approval. If there is even one little part of you that wants the approval of another person to make you feel better about yourself, boost your confidence, or bolter your sense of who you are in the world, then you are a gaslightee waiting for a gaslighter. So developing a strong, clear sense of yourself and your worth is crucial to staying out of gaslighting relationships.
— Dr. Robin Stern, The Gaslight Effect, p. 224