Proverbs 10:31 The mouth of the just bringeth forth wisdom: But the froward tongue shall be cut out.
We need to know what is acceptable to say when we serve God as pastors, missionaries or soul winners. We must have wisdom to give. We can only get wisdom from the word of God and it is based in a reverence to God and his word and not just head knowledge. If you do not live what you preach then it is not acceptable nor wisdom.