The word influence is not a biblical word, but we will see that it is a biblical concept. (Acts 25: 2 speaks of "the most influential," that is, the first or the main ones.)
According to Larousse, the influence is "Action that exerts a thing on a person or on something else: influence of public opinion, authority, importance: having influence in society." Influence is the force that man has to affect others. This force is exercised consciously or unconsciously.
Those who have a lot of influence in the world are, for example, the rich, the scientists, those who occupy high positions in government, authors, artists, athletes, etc.

Jesus Christ has had and has a lot of influence.

      A. He has had more influence than any other in human society because "In him was life, and life was the light of men", John 1: 4.

      B. He has exercised his influence through his life, his teaching, his death, burial, resurrection, and ascension to reign as King of kings and Lord of lords.

      C. In the first centuries of our Christ era, the gospel and the Christians changed the Roman world.

The disciples of Christ have influence because they are the salt of the earth.
"You are the salt of the earth," Matt. 5:13
As salt exerts an important action in keeping the flesh of corruption, so too do Christians preserve the world of corruption.