en_tn/act/11/23.md

saw the grace of God

"saw how God acted kindly toward the believers"

he encouraged them

"he kept on encouraging them"

to remain with the Lord

"to remain faithful to the Lord" or "to continue to trust in the Lord"

with all their heart

Here the "heart" refers to a person's will and desire. AT: "with all their will" or "with complete commitment" (See: rc://en/ta/man/translate/figs-metonymy)