נָחַ֣לְתִּי עֵדְוֺתֶ֣יךָ לְעוֹלָ֑ם כִּֽי־שְׂשׂ֖וֹן לִבִּ֣י הֵֽמָּה׃
Je reste pour toujours en possession de tes vérités, car elles sont la joie de mon cœur.
Radak
rejoice the heart: – for the wise man rejoices over his understanding; and when it gains control over the body and leads it in the ways of understanding there is no joy in the world like that joy, which is the joy of the soul. For this reason he says rejoicing the heart, and does not say rejoicing “man,” for man rejoices in the lusts of the world; but the understanding – that is, the heart – rejoices only in the ways of understanding. And so it says (Ps. cxix. iii): “For they are the rejoicing of my heart.” And he says: