JMNT(i)
18 "so wheresoever it may seize him or get him down, it repeatedly dashes him [upon the ground] (or: [inwardly] tears and rips him up), and he continues frothing and foaming at the mouth, as well as grinding his teeth, and he progressively withers (either: becomes weak and limp; or: becomes rigid and stiff). So I spoke to your disciples so that they would cast it out (or: throw if forth from out of the midst; eject it), and yet they did not have the strength (or: they are not strong [enough])."
19 Now He, responding with a considered reply, is then saying to them, "O generation without faith and trust (or: faithless, disloyal and unbelieving generation)! Till when will I continue in being facing toward (or: being with) you folks? Till when am I continuing holding back with you (or: = bearing or putting up with you people)? Go ahead and bring him to Me."
20 So they brought him to Him, and at having seen Him, the spirit (breath-effect; attitude; mood and internal disposition; result of a breath or of breathing) at once violently convulses him and then, falling on the ground, he began rolling and wallowing (or, as a passive: continued being rolled) while continuously frothing at the mouth.
21 So He asked his father, "How much time (or: How long) is it that something like this has happened to him, and continued being thus for him?"
22 And [the father] said, "From childhood on. Further, many times it also throws him into fire or into places of water, so that it might destroy him (or, possibly: that it can loose-away from him). But now, if you continue having power and ability [to do] anything, in instant out-flowing of compassion upon us, come quickly to our aid, and help us!"