The Peace That Passes Understanding
The Teaching
Rejoice in the Lord always. I will say it again: Rejoice! Let your gentleness be evident to all. The Lord is near. Do not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present your requests to God. And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus.
Commentary
The peace that passes understanding is not mere emotional calm. It is the peace of being aligned with the ground of existence itself, a peace that cannot be rationally grasped because it underlies reason itself.
Paul's 'transcends all understanding', hyperecho in Greek, points to something prior to conceptual thought. This is what the Mandukya Upanishad calls Turiya, the fourth state that underlies all other states of consciousness. It is what The Cloud of Unknowing calls the divine darkness.
The Stoic teaching of Epictetus operates in the same territory: equanimity not as emotional flatness but as the stable ground of the one who has ceased to place their wellbeing in things outside their control.