TSK · Mark 14:15

then hear from heaven, your dwelling place and forgive, and render to every man according to all his ways, whose heart you know; (for you, even you only, know the hearts of the children of men;)

The plans of the heart belong to man, but the answer of the tongue is from Yahweh.

But Jesus didn't trust himself to them, because he knew everyone,

When they had come in, they went up into the upper room, where they were staying; that is Peter, John, James, Andrew, Philip, Thomas, Bartholomew, Matthew, James the son of Alphaeus, Simon the Zealot, and Judas the son of James.

However God's firm foundation stands, having this seal, "The Lord knows those who are his," and, "Let every one who names the name of the Lord depart from unrighteousness."