What do you understand by the communion of saints?

#HC55

First, that believers, all and everyone, as members of Christ have communion with Him and share in all His treasures and gifts. Second, that everyone is duty-bound to use his gifts readily and cheerfully for the benefit and well-being of the other members.

Proofs

First, that believers, all and everyone, as members of Christ have communion with Him and share in all His treasures and gifts. (Romans 8:32; 1 Corinthians 6:17; 1 Corinthians 12:4–7; 1 Corinthians 12:12–13; 1 John 1:3)
Second, that everyone is duty-bound to use his gifts readily and cheerfully for the benefit and well-being of the other members. (Romans 12:4–8; 1 Corinthians 12:20–27; 1 Corinthians 13:1–7; Philippians 2:4–8)