Adolescence /ˌæd

proportion /prəˈpɔː.ʃ ə n/ /-ˈpɔːr-/ noun IMPORTANCE
5. [ U ] used in a number of phrases to mean importance and seriousness
You've got to keep a sense of proportion (= the ability to understand what is important and what is not) .
I think a certain amount of worry about work is very natural, but you've got to keep it in proportion (= judge correctly its seriousness) .
reflection /rɪˈflek.ʃ ə n/ noun RETURN
1. [ C or U ] the image of something in a mirror or on any reflective surface
In Greek mythology, Narcissus fell in love with his own reflection in a pool of water.
He put silver foil around the fire to increase heat reflection.