John Calvin on John 17:7

7. Now they have known. Here our Lord expresses what is the chief part in faith, which consists in our believing in Christ in such a manner, that faith does not rest satisfied with beholding the flesh, but perceives his Divine power. For when he says, They have known that all things which thou hast given me are from thee, he means, that believers feel that all that they possess is heavenly and divine. And, indeed, if we do not perceive God in Christ, we must remain continually in a state of hesitation.