He believed he was not worthy- as in several poems. That is considered to be a higher spiritual stance. Higher than those tele-evangelist who say they talk to God and look down their noses at us.
Well, at least that's what I gather from some of his writing and maybe I am putting my own slant on it.
At least, making a casual refrence to heaven says something. IMO. St. Hank of San Pedro.
Strange how the realistic bike has an abstract human-like something stuck on top of it. And what's that strange little object opposite the flower pot? With an arrow pointing up, to Heaven? An odd drawing, and early, 1964.