What mean those words, The Communion of Saints?

#AOC54

First, that all and every one who believeth, are in common Partakers of Christ and all his Graces, as being his Members; and then that every one ought readily and chearfully to bestow the Gifts and Graces which they have received to the common Commodity and Safety of all.

Proofs

First, that all and every one who believeth, are in (1 John 1:3; Romans 8:32; 1 Corinthians 1:2; 1 Corinthians 3:21; 1 Corinthians 6:17)
common Partakers of Christ and all his Graces, as being his Members; and then that every one ought (1 Corinthians 12:21; Philippians 2:4–6)
readily and chearfully to bestow the Gifts and Graces which they have received to the common Commodity and Safety of all.