Observation: it’s a loaded word and probably why Marilyn used it. Observation not only implies watching things, but making judgments based on what you have seen. I don’t know how you could really obtain wisdom from making judgments without testing them.
This is one of those quotes that sounds really good, but ends up being not very helpful in real life. Sure I can study. Sure I can observe. I’ll do the best I can but I think a little trial and error is better for the mind than all the observation of a lifetime.