Prophetic Frustration

All prophets experience rejection, if their words are not always accepted and obeyed. If this happens frequently, the prophet can become frustrated, and frustration can lead to bitterness. Words spoken out of frustration and bitterness will be contaminated by these things and will not come out pure. This is one of the most serious problems faced by prophets. They must learn to deal with rejection without going into frustration and bitterness.

More at Prophetic Pitfalls