Quote 4
"I never noticed colors or clouds and stuff until you keep reminding me about them. It's almost like they weren't there before." (5.63)
Johnny is getting nature appreciation training from Pony. Becoming aware of the beauty of nature is a major awakening for him. Even though he doesn't live long enough to fully appreciate it, Johnny's expanded vision is reflected in his deathbed letter.
Quote 5
"I'm sure. It ain't fair for Ponyboy to have to stay up in that church with Soda and Darry worryin' about him all the time." (6.17)
Before the fire, Johnny makes the brave decision to turn himself in. The fact that he takes the needs of Pony, Darry, and Soda into account in his decision shows how what a thoughtful person he's growing into.