Psalm 78:4: We will not hide from their children, but will recount to generations to come, the praises of the Lord and his power and the wonderful works he has done.
Have you ever considered the simple things like 'how do we learn?' We learn from others; when they tell us the truth, we learn something new.
How much of an impact would it make on someone else's life if you were able to tell them all you know about Jesus. That may be very little or it could be 'volumes' of information.
The more we share the Gospel with others the more other people will be able to hear about the good news.
This does not mean we have to stand on the street corner and shout about Jesus - that may be effective in some areas but it could turn a community against you in others.