Crossword puzzle clue "your will to serve must be mature to be this keeper of nature"

"Your will to serve must be mature / To be this keeper of nature"

"Borrow trouble for yourself, if that's your nature, but don't ___ it to your neighbors": Kipling

"He must have a long spoon that must ___ the devil"

"For men must ___ women must weep": Kingsley

Act your ___ (be mature)

Yell at your parents for not making the soup salty enough because your crush told you your mouth looks too funny to kiss, e.g.

Performed in a way that made your parents leave your school play in the middle of your solo :/

The "you" in "you will serve your brother"