Psalm 38:13 But I, as a deaf man, heard not; and I was as a dumb man that openeth not his mouth.
As they spoke evil he was as a deaf and dumb man. He did not hear and neither did he respond. There is a good lesson for the missionary or disciple trainer. Often times you will be misunderstood and people will criticize. Be careful not to hear or speak. Let God take care of you.
There is no way to be in spiritual ministry and not be criticized. You know you are going to be misunderstood. People will attack you. They will lie about you!
In the world we currently live in it seems that some are dedicated to trolling the internet and religious world looking for ways to attack others. It is best to be deaf to it!
It is good to even to be deaf to the good things people say about you. That way you will not begin to think to highly of yourself.
Remember those that love you and say great things today may be doing the opposite tomorrow!