We learn this by the precepts that Jesus left. He observed that the people were looking outward, and assured them that the kingdom of God cometh not with outward observation; and for this reason, that it was only to be known in man. ↗
But the hour cometh, and now is, when the true worshippers shall worship the Father in spirit and in truth: for the Father seeketh such to worship him. God is a spirit: and they that worship him must worship him in spirit and in truth. ↗
Put a bridle on thy tongue; set a guard before thy lips, lest the words of thine own mouth destroy thy peace... on much speaking cometh repentance, but in silence is safety. ↗