Recently however I was reading a Joseph Prince devotional. He worded it perfectly. "It may be a fact that you are sick. The doctors say that you are sick. The X-ray film shows that you are sick. But God’s Word says that by Jesus’ stripes you are healed! (Isaiah 53:5) That is the truth about your situation. What is the difference between fact and truth? Facts change, but truth — God’s Word — remains!"
You see speaking things to life is based on authority given to you by God. Since He gave you that authority, anything you say is true. Even if it has yet to be, the moment you speak it, you give it life!