“My flesh yearns for you” (Tehillim 63:2). Rashi comments: “This expression connotes desire, and it has no comparison.” [The simple meaning of this is that there is no word found in Tanach that is similar to this one.] The Baal Shem Tov interprets that the pleasures of the flesh that a person desires by the nature of his body that Hashem endowed in him from birth are no comparison at all to the pleasure that King Dovid, peace be upon him, desired in his flesh for G–dliness.Sefer HaMa’amarim 5703, p. 178.
If those who indulge in lusts were to know the tremendous pleasure in matters of G-dliness that can be attained through study of Chassidus, and especially through learning the holy Tanya, they would abandon all their lusts and pursue only the holy Tanya.
However, in Shemu’os V’Sipurim, Vol. 3, p. 229, Reb Hillel Paritcher is quoted as saying:
If those who indulge in lusts were to know the tremendous delight in tasting matters of G–dliness, they would abandon all their lusts and pursue G–dliness.
Similarly, we find that the highest level of love of G–d, one experienced only by perfect Tzaddikim, is known as ahava be’taanugim, “love of pleasures,” (see Tanya ch. 9) and it is a foretaste of the intense pleasure that the soul will experience in Olam Haba, the age of resurrection.