“Everyone has a special gift in some particular field of endeavor, and in that field is called on to make a special contribution.
The Sages say that in addition to keeping all the commandments, one should choose a single observance in which to be particularly scrupulous and diligent—‘more careful,’ in the words of the Talmud.
In this choice, one can be guided by the prompting of one’s own heart and inclinations.
--Rabbi Adin Steinsaltz
From “The Relation to the Past,” in Teshuvah by Rabbi Adin Steinsaltz