בְּאֹ֣רֶךְ אַ֭פַּיִם יְפֻתֶּ֣ה קָצִ֑ין וְלָשׁ֥וֹן רַ֝כָּ֗ה תִּשְׁבָּר־גָּֽרֶם׃
By long forbearing is a ruler persuaded, And a soft tongue breaketh the bone.
Read kabbalistic (mystical) interpretation of Proverbs 25:15: and classical mystical sources.