Mark 11:23
23 For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith.
Now, Jesus also mentioned not doubting in the heart. We have discussed that you can speak your faith independent of your mental faculties and emotions. Even if your mind and emotions are sending out a signal contrary to what you believe in your heart, you mouth can still speak words of faith.
In fact, when you do this, the power in the Word of God can redirect the thoughts and feelings to agree with what you are saying. This is one way you train them to stay in line with the faith in your heart. It is a way to take dominion over them and bring them into submission to the Word of God.
Speaking faith releases and carries faith into every realm of life. Speaking faith sends faith as an ambassador to the world, to others, to your own mental and emotional faculties and even into spiritual darkness. It represents you faith in these places and releases the power contained in God's Word to make the changes decreed by your faith words.