"Shivisi - I have set G-d before me at all times." (Tehillim 16:8)

Shivisi is an expression of hishtavus (equanimity): no matter what happens, whether people praise or shame you - or with anything else that comes your way - it is all the same to you. This applies likewise to food: whether you are eating delicacies or other things, it is all the same to you. For [with this perspective] the yetzer hara is entirely removed from you.

Whatever may happen, say that "it comes from [G-d], blessed be He, and if it is proper in His eyes...." Your motives are altogether for the sake of Heaven, and as for yourself, nothing makes any difference.

This [sense of equanimity] is a very high level.

Tzava'at HaRivash, The Testament of Rabbi Israel Baal Shem Tov, p. 1