אִם־לֹ֤א שִׁוִּ֨יתִי ׀ וְדוֹמַ֗מְתִּי נַ֫פְשִׁ֥י כְּ֭גָמֻל עֲלֵ֣י אִמּ֑וֹ כַּגָּמֻ֖ל עָלַ֣י נַפְשִֽׁי׃
Surely I have stilled and quieted my soul; Like a weaned child with his mother; My soul is with me like a weaned child.
Read kabbalistic (mystical) interpretation of Psalms 131:2: and classical mystical sources.