לֵ֣ב צַ֭דִּיק יֶהְגֶּ֣ה לַעֲנ֑וֹת וּפִ֥י רְ֝שָׁעִ֗ים יַבִּ֥יעַ רָעֽוֹת׃
The heart of the righteous studieth to answer; But the mouth of the wicked poureth out evil things.
Read kabbalistic (mystical) interpretation of Proverbs 15:28: and classical mystical sources.