How do you know when a dream is from God or when it's just something you've thought up yourself? The Bible tells us that God, "by his mighty power at work within us is able to do far more than we would ever dare to ask or even dream of—infinitely beyond our highest prayers, desires, thoughts, or hopes." (Ephesians 3:20 LB)
In other words, if a dream comes from God, it will be so big in your life that you can't do it on your own. If you could do it on your own, you wouldn't need faith. And if you don't have faith you're not pleasing God, because the Bible says whatever is not of faith is sin. (Roman 14:23)
God starts to build your faith by giving you a dream. He may be speaking to you now, but you just don't recognize it for what it is. That dream you have—the idea, the concept —that thing you've been thinking about doing that would be of real benefit to other people, where do you think that idea came from?
God will never tell you to do something that contradicts his truth. In other words, he won't give you a dream of leaving your family and kids and moving to Hollywood to be a movie star. If you've got that dream, then you can know it is not from God.
God starts with a dream as he works within your life to build faith.