In sketching I observed it

Oh, I “remember” places I’ve been and things I’ve seen. I could tell you about sitting in a pub on Kings' Road and seeing a table of spike-haired kids starting a little fire in an ash tray with some lighter fluid. I could tell you, and you would be told, and that would be that. But in sketching it I preserved it. I had observed it.

I found this was a benefit that rendered the quality of my drawings irrelevant. Whether they were good or bad had nothing to do with their most valuable asset: They were a means of experiencing a place or a moment more deeply.

Referenced from You can draw, and probably better than I can.