1 Samuel 14:7

And his armourbearer said unto him
Very readily and cheerfully:

do all that is in thine heart;
whatever is thy pleasure, that thou hast a mind to do, that is upon thy heart, and thou art desirous of, and strongly inclined and affected to:

turn thee;
which way thou wilt, towards the garrison of the Philistines, or elsewhere:

behold, I am with thee, according to thy heart;
I will go with thee wherever thou goest, and do whatsoever thou wouldest have me to do; I am at thy command, and according to thy wish and desire, and in all things subject to thy will; I am as thine own heart.