Acts 14:3
Therefore they stayed there a long time, speaking boldly in the Lord, who was bearing witness to the word of His grace, granting signs and wonders to be done by their hands.
Easton's Bible Dictionary
Grace:
(1.) Of form or person (Pro 1:9; 3:22; Psa 45:2). (2.) Favour, kindness, friendship (Gen 6:8; 18:3; 19:19; 2Ti 1:9). (3.) God's forgiving mercy (Rom 11:6; Eph 2:5). (4.) The gospel as distinguished from the law (Jhn 1:17; Rom 6:14; 1Pe 5:12). (5.) Gifts freely bestowed by God; as miracles, prophecy, tongues (Rom 15:15; 1Cr 15:10; Eph 3:8). (6.) Christian virtues (2Cr 8:7; 2Pe 3:18). (7.) The glory hereafter to be revealed (1Pe 1:13).
Romans 5:20
Moreover the law entered that the offense might abound. But where sin abounded, grace abounded much more,
Ephesians 2:8-9
For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast.
The Lord bore witness to the Word of His grace, granting signs and wonders to be done by their hands. God confirmed the Word of His grace. Not the word of the law, but the Word of His grace. Grace is forgiving mercy as distinguished from the law. They must have talked about the unmerited favor of God and the gifts, for He bore witness to what they said with signs and wonders. Jesus Who saves and heals and delivers without prerequisites. I need to chew on this more. For (remember) where sin abounds, grace does much more abound. He is not waiting for us to become worthy. He has already made us worthy. Don’t let the accuser of the brethren tell you any different.