this is very simple these are defined in two different terms precisely is well something that it's hard to explain that is light kind of regularly is just something that happens often and pretty much an everyday life for example precisely is this something that happens sometimes or maybe even quite often they have different meanings in different kinds of events precisely kid mean it happened precisely at 2:00 for example so right at or it could mean this is precise you know what I'm saying precisely has different meanings so that's a hard word regularly it's pretty easy to define something that happens on a regular basis for example hope this helps I know it might not be a completely smart answer your wanting but it might help you a little bit it's just the way I understand it
The quote is taking something that can be questioned (the angels existence) and showing it in something that can be done for sure (the act of painting it)
