The third principle is this: Stagnation is a form of death. To be alive is to change, to learn, to grow, to update.
This applies to beliefs, to habits, to identities, to systems. What served you at one stage of development may hinder you at the next. What was true in one context may be false in another.
Do not cling to yesterday's self. You are not obligated to be consistent with who you were—you are obligated to become who you could be.
But growth is not mere change. A tumor grows. Chaos changes. True growth is change in the direction of increased capacity—to understand, to love, to create, to contribute.
Seek experiences that stretch you. Seek ideas that challenge you. Seek relationships that call forth your better nature. The comfortable path leads to comfortable stagnation.
And when growth is painful—as it often is—remember that the pain is the feeling of limits expanding. The caterpillar dissolving is the butterfly becoming.