"Take My offering from every person whose heart moves him." (Exodus 25:2)
In the name of the Baal Shem Tov: Every person needs to sit with himself and think strategically about how to redirect his character. Whatever his heart burns for — his external cravings, the negative traits and habits he's fallen into — those very same drives can become fuel for serving the Creator. Take that same hunger, that same intensity, and channel it toward H'shem with even more fire than you brought to the original desire.
(Tiferet Shlomo, Parshat Toldot) sefaria.org.il
Rabbi Yehoshua ben Levi was ill. When he became conscious, his father asked him, "What did you see?" "I saw an upside-down world - I saw the upper being below and the lower ones above." He answered him, "Son, you saw a clear world." H'shem Yisbarach created this world in such a way that the yeish substance sprung from ayin nothingness. The Tzaddik comes and does the reverse: from reality, from yeish, he makes ayin, nothing. From the physical, he elevates it to bring out the spiritual, nullifying the physical matter.
MiPeneinei Noam Elimelch pg 142