Holding your peace is an action, even if a state of mind. The Lord will fight for you, but you must hold your peace and remain in rest. Guard it!
“The Lord will fight for you, and you shall hold your peace and remain at rest.”
Exodus 14:14 AMPC
“You will keep him in perfect peace,
Whose mind is stayed on You,
Because he trusts in You.”
Isaiah 26:3 NKJV