To believe in Jesus is a great gift from God. Anyone that does a good act to another in His name are certainly blessed. Also, if someone gives you just a cup of water because you believe in the Lord, they too will receive a reward. On the other hand, if we should block others from believing in the Lord, Jesus tells us in very descriptive language that there will be a price to pay. How we deal with each other reminds us of our responsibility vis-à-vis the examples, either good or bad, that we portray in our way of living.
Recall in your own life those to whom you are deeply indebted for the good advice and example you received from them. They may not even know of their effects on you: you never know when you are being watched.