Acts14:3 Therefore they spent a considerable amount of time speaking with boldness in the Lord, who testified to the word of His grace by granting signs and wonders to be done through their hands.
In the synagogues the Jewish people did not read the Old Testament in order to know the word of the Lord's grace. Rather, they read the Scriptures in order to know the word of God's law, a word belonging to the old dispensation, to the former divine arrangement of God's economy. But the word of the Lord's grace replaces the law.
The minds of the Jewish people in the synagogues were occupied with the law. But Paul preached Christ as grace to them. Consider Genesis 3:15: "I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel." Here we see that the seed of the woman will bruise the serpent's head.
Is this not a word of the Lord's grace? Certainly it is. After Adam and Eve had eaten of the fruit of the tree of the knowledge of good and evil, they tried to hide from God.
The voice of the Lord sounded out to Adam and said, "Where art thou?" (Gen. 3:9). Adam and Eve were frightened, perhaps thinking that God would sentence them to death.
But instead of speaking a word of condemnation or judgment, the Lord spoke a word of grace. In Genesis 3:15 He condemned the serpent and gave Adam and Eve a word of grace. Adam and Eve must have been very happy when they heard the Lord's word in Genesis 3:15.
They must have hated the serpent, and now the Lord was telling them that the seed of the woman would bruise the head of the serpent. This surely is a word of grace.