We all have no doubt seen a rock or even a pebble dropped into water and watched the waves ripple out in all directions.
Those Ripples come from the rock interacting with the water creating movement.
Our physical lives can have a similar impact on the people around us.
1Co 3:5-7 Who then is Paul, and who is Apollos, but ministers by whom ye believed, even as the Lord gave to every man? (6) I have planted, Apollos watered; but God gave the increase. (7) So then neither is he that planteth any thing, neither he that watereth; but God that giveth the increase.
While he was saying the main part is Gods part. He did describe the part others play in this life changing process. He called it - planting and watering.
You can touch other people in a way that creates positive spiritual ripples in their life.