This may be point-blank obvious to writers . . . or even most writers.
“Show character-istics through scenes, details, and dialogue.”
Do you know how many descriptors are abstract phloof? For instance, here is a sentence: she was compassionate.
Hmmm . . . that’s great. I am glad she was compassionate. What does that mean? What does it look like? Clark uses this example about a compassionate girl who gave her coat to a homeless girl and pleaded for the life of the tiger who gnawed her arm off. Now that’s compassion, and not just in black and white letters.
Show the abstractions.