I take it from the line I've bolded near the end, that a revolting image that just comes up unbidden during meditation, while one is actually INTENDING to practice properly and focus on the breath, is still a 'volitional formation' despite the fact that, in the present moment, one neither intended it, nor likes it at all.A second major domain where the word sankharas applies is among the five aggregates. The fourth aggregate is the sankhara-khandha, the aggregate of volitional formations. The texts define the sankhara-khandha as the six classes of volition (cha cetanakaya): volition regarding forms, sounds, smells, tastes, tactile objects, and ideas. Though these sankharas correspond closely to those in the formula of dependent origination, the two are not in all respects the same, for the sankhara-khandha has a wider range. The aggregate of volitional formations comprises all kinds of volition. It includes not merely those that are kammically potent, but also those that are kammic results and those that are kammically inoperative. https://www.accesstoinsight.org/lib/aut ... ay_43.html
I would welcome clarification of any kind. Are images or thoughts like this, results of past kamma? Why would they arise, when our current state of mind is predominantly wholesome (ie, trying to meditate)?