"A man's belly shall be satisfied with the fruit of his mouth; and with the harvest of his lips shall he be filled. Death and life are in the power of the tongue: and they that love it shall eat the fruit thereof" - Proverbs 18:20-21
......... Please note that it is called a harvest. God is talking about the harvest that we speak; He is talking about the fulfilment, the blessings, the over-running abundance of that which we speak, whether that is positive or negative......
READ THE TEACHING AT:
http://www.voiceinthecity.org/en/resources/teachings/37-prayerandthefruitofourlips.html