The posuk in parashas Tzav writes:
and the fire of the altar shall be kept burning in it.
The Lubavitcher Rebbe in Likkutei Sichos (Vol. 1, p. 217; parashas Tzav) explains that the Torah we study must be with continuous excitement. Not only the study, also the application of what we study. The Divrei Emes (from Rabbi Yaakov Yitzchak Horowitz, the Hoozeh of Lublin), also echoes this idea, e.g. to serve him with enthusiasm.
The Rama in Orach Chayim, siman 264:9 writes:
And in all cases our custom is to light the wick and to then extinguish it so that it may be charred (before [re]kindling them for the sake of the mitzvah) [so that] the flame should catch on well.
According to the explanation of the Rama, the flame gets stronger when it's extinguished once before, and then re-kindled. This got me thinking. The posuk, and the deeper meaning behind it, tells us to not extinguish our "inner flame" and to serve G-d with continuous excitement and enthusiasm (Likkutei Sichos and the Divrei Emes). But, are there sources that discuss the idea that our "inner flame" and our Torah gets stronger, if we, G-d forbid , lose excitement for a moment (this is compared to what the Rama writes; extinguish the flame, then re-kindling it). Is that a concept?
As always, please cite any sources. Answers explaining the concept @shmosel talks about are also welcome.
Please note that I am not asking if the "inner light" needs to be completely distinguished (G-d Forbid), but rather if diminishing of this light, e.g. we experience less excitement for a while, is to make sure that it returns to us in stronger form.