Maybe the idea is like “interpret” or “elucidate”. Here are my simplified notions.
(1) seems easier.
“Charity begins at home”: Supporting one’s family should come before supporting others.
Example: “Why don’t you give more money to the church and the orphanage? You don’t seem very charitable.” / “Charity begins at home. I give my money to my needy relatives.”
(2) seems difficult.
“A rolling stone gathers no moss”: If one keeps moving he doesn’t accumulate things.
This is ambiguous: the “moss” (accumulated things) can be ‘good’ (money, good relationships) or ‘bad’ (responsibilities).
Example: “I’m tired of this place. I think I’ll try moving to Alaska.” / “You will never get rich or establish stable friendships by moving around. A rolling stone gathers no moss.”