Matthew 16 discusses building on the rock. Matthew 7 had already defined that rock. There’s self serving logic, truth, and God’s Truth.
Matthew 7:24 “Everyone then who hears these words of mine and does them will be like a wise man who built his house on the rock.”
Ya, that’s why Christ said “What soever you bind on earth shall be bound in heaven and what soever you loose on earth shall be loosed in heaven.”
That was just for Peter’s lifetime, right?
Give up on the big rock, little rock nonsense.
It’s too easy to obliterate.