John 14:1
1“Don’t let your heart be troubled. Believe in God. Believe also in me.
Troubled hearts (13:38 still ringing) are met with a double believe. Faith in the Father and in the Son is the prescribed calm.
The command not to be troubled is not a scold; it is a path. They can believe; grace that has shown them the Son now steadies them in Him.
Calvin: faith is the remedy for a troubled heart. Believe in God; believe also in me—one trust with two named objects.
He does not offer a technique. He offers Himself as the object that stills.