Spirit, soul, inner self, Buddha nature, Christ Consciousness, Self with a capital S, awareness, inner being… whatever words we want to use, they’re all pointing to the same thing..
The only unchanging certainty throughout all our life, is the knowing that we exist.
Stability is within Self knowing.
Self knowing stripped of all ideas, identities or possessions one might add on top of their pure presence.
Everything in life changes but our essential spirit. Know yourself as this, be this, and stability will come.