"And Jesus answering saith unto them, 'Have faith in God. 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'” (Mark 11:22-23). In today’s language this would read something like this: “Jesus spoke to the mountain, and it was gone.” While explaining it Jesus said, “This is the way you operate the faith of God: You speak the desired result and do not doubt in your heart. You believe that your words have power, and the things you say will come to pass. The result is that you can have whatever you say when you believe.” He said to believe the things you say will come to pass. That doesn’t mean you can continue to speak any way you want, and then in a time of need suddenly exercise faith in God’s words. If you really believe faith words, you should speak them all the time.
You must change your vocabulary and guard your speech, so that your words are becoming to Jesus. All your words should be words of faith. You should only speak words you want to come to pass and believe they will produce results. By getting into the Word of God and continually feeding on it, you can come to the place where all your words will come to pass. When your words are words of faith, God can trust you with His power in the words of your mouth. What you speak, good or bad, is what you will receive. “For out of the abundance of the heart the mouth speaks” (Matthew 12:34). The force of faith must be behind your words for them to cause things to come to pass. You must believe in your heart! Your mouth will speak what is put in your heart. If faith-filled words are put into your heart, that's what will come out. If doubt and unbelief are put into your heart, that's what will come out. Words bring things to pass. Your words work for you or against you. Make sure your faith-filled words are working for you!