We must always make sure that we speak truth in a way so that it isn't misheard.
What is said: "If you give, Jesus will bless you."
What is heard: "If you don't give, Jesus won't bless you."
Why this is so wrong: God's blessing of us and attitude towards us is not dependent upon our actions. Luther says of this when preaching on Luke 5: "If God did not give us anything unless we had earned it and were worthy of it, He could hardly give us bread and plain water. But He does not intend to look at our merit and worthiness but at our need and His grace and mercy." The focus of giving should not be what we will get, for that implies an ability to earn or merit goodness from God. We give because we can, because it pleases God and we like please God. It helps folks - that's good, and good enough for us.
+ + + + + + + + +
What is said: "Everyday people are dying without Jesus"
What is heard: ".... because you haven't given enough - so yes, you send them to hell."
Why this is so wrong: This is so egotistical. We understand that God uses means, that God uses us to work His will, to speak His truth. But I as an individual am not the only person whom God uses - and if I fail, if I falter, He will use someone else to accomplish His purpose of having the Holy Spirit speak faith into people when and where He wills. I don't have to do X, I don't have to support mission Y over mission Z. I simply live, I simply remain God's workmanship, and he puts me to use, and should I fail, He'll use somebody else.
Anyone got any others? There's tons more, I'm sure. . . but these are the ones that have stood out the most to me right now.