The Power To Dance- When Even The Sky Isn't The Limit

Two Talmidei Chachomim who were students of the Chiddushei Ha-rim were dancing on Simchas Torah. The Chiddushei Ha-rim pointed to one of them and predicted that will get tired and stop dancing before the other. He was correct.

He explained that the first one [who tired more quickly] was dancing from the simcha he has from the Torah he had learned the previous year. Since that is limited, he ran out of gas. The other one was dancing with the simcha of the Torah he was planning to learn in the next year. That is limitless. Hence, he didn't tire out.

[Maamarei Pachad Yitzchak 57]