John 2:22-25

So when He had risen from the dead, His disciples remembered what He had said. And they believed and trusted in and relied on the Scripture and the words that Jesus had spoken. [Ps 16:10] 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]