John 2:23-25

Now when He was in Jerusalem at the Passover feast, many believed in His name [identifying themselves with Him] after seeing His signs (attesting miracles) which He was doing. But Jesus, for His part, did not entrust Himself to them, because He knew all people [and understood the superficiality and fickleness of human nature], and He did not need anyone to testify concerning man [and human nature], for He Himself knew what was in man [in their hearts—in the very core of their being]. [1 Sam 16:7]