נָחַ֣לְתִּי עֵדְוֺתֶ֣יךָ לְעוֹלָ֑ם כִּֽי־שְׂשׂ֖וֹן לִבִּ֣י הֵֽמָּה׃
Thy testimonies have I taken as a heritage for ever; for they are the rejoicing of my heart.
Read kabbalistic (mystical) interpretation of Psalms 119:111: and classical mystical sources.