Proverbs 4:23
Keep your heart with all diligence, for out of it is the wellspring of life.
Wisdom shapes a guard heart that is embodied in work and rest. Proverbs 4:23: trace "keep" and "heart". Align guard heart in promises we keep—anchor courage in promise.
Proverbs speaks here as poetry/wisdom writing, naming guard heart. Placed in ch. 4, the nearby lines set its tone. There’s a line into wisdom & worship. The nearby sentences supply the texture.