Psalms 37:30 Kabbalah

פִּֽי־צַ֭דִּיק יֶהְגֶּ֣ה חָכְמָ֑ה וּ֝לְשׁוֹנ֗וֹ תְּדַבֵּ֥ר מִשְׁפָּֽט׃

The mouth of the righteous uttereth wisdom, and his tongue speaketh justice.

Read kabbalistic (mystical) interpretation of Psalms 37:30: and classical mystical sources.