I think that we often underestimate the impact that we have on others. Many years ago I came to the conclusion that the only thing that creates permanent change in our world is people exchanging ideas. Think about it. If I am having a conversation with anyone then I am exchanging ideas. I'm doing it right now with you.
Anyone taking part in a conversation goes away with their thoughts and world view either reinforced by the ideas of others, or changed, even ever so slightly.
So we do influence other people when we exchange ideas. The question is; how are we influencing them? As Christians we need to be careful and prayerful about which ideas we present to our children, our fellow Christians and to non-Christians. I pray, indeed I plead, that God will make sure that I say the things that he wants me to say and, just as importantly, that he will prevent me from saying the things that he doesn't want me to say.