אִם־נָבַ֥לְתָּ בְהִתְנַשֵּׂ֑א וְאִם־זַ֝מּ֗וֹתָ יָ֣ד לְפֶֽה׃
If thou hast done foolishly in lifting up thyself, Or if thou hast planned devices, lay thy hand upon thy mouth.
Read kabbalistic (mystical) interpretation of Proverbs 30:32: and classical mystical sources.