en_tn_condensed/col/03/12.md

as God's chosen ones, holy and beloved

"as those whom God has chosen for himself, whom he desires to see live for him alone, and whom he loves"

put on a heart of mercy, kindness, humility, gentleness, and patience

The "heart" refers to feelings and attitudes. Alternate translation: "have a merciful, kind, humble, gentle, and patient heart" or "be merciful, kind, humble, gentle, and patient"