Musar к Мишлей 1:23

[It seems apt to explain "fall" instead of "will fall" according to what the GRA has written on Mishlei 1:23 in connection with men of levity: "They have a great lust to speak idle talk and levity even though they have no bodily pleasure therefrom. For with every thing that a man does he is given a spirit from on high. And this spirit does not rest until it does other such things, wherefrom he has pleasure — both in an act of mitzvah or in an act of sin. And this is the intent of Avoth 4:2: 'A sin begets a sin and a mitzvah begets a mitzvah.' And the greater the sin, the greater the spirit that it begets, and the more it lusts for more sin. Correspondingly, with a great mitzvah. A spirit comes from a very holy place and lusts greatly for that mitzvah and has great pleasure in that mitzvah. And it is known that the greatest mitzvah of all is Torah study, and, conversely, [the greatest sin of all,] idle speech and levity, which is the opposite of Torah. Therefore, there is more pleasure in idle speech and levity than in all other sins, even though there is no worldly [i.e., bodily] pleasure in this. But [the pleasure arises from the fact that] the spirit of uncleanliness is extremely great, like a 'bubbling spring,' as opposed to the [pure spirit of] Torah, which is [also] a 'bubbling spring.'" And it is known that the spirit of uncleanliness created by the sin, itself punishes the doer, after his death, in Gehinnom, wherefore Chazal have said "fall into Gehinnom" [rather than "will fall"]. For at the very utterance of the levity the great spirit of uncleanliness hovers above him. And he actually falls [that is, "dwells," as in (Bereshith 25:18): 'In the presence of all his brothers, he fell' (i.e., dwelt)] in Gehinnom in his lifetime, G-d forbid, (as written in Nefesh Hachaim, Gate One, Chapter 12. And their second apothegm is also to be explained along these lines.)]