Siman 554

(111.) "Wisdom is nothing — the main thing is only the heart and the action of the limbs: that one's heart should always long and yearn for His service, may He be blessed — and one should always be longing: when will one come to His service as is fitting? And this is a very great matter. And one should pray about this always — particularly in the vernacular as is one's common speech — as is explained elsewhere [Likutay Tinyana, 25]. And one should persist for many long days and years in the longings and yearnings and prayers..."