If a dream comes from God, it will be so big that you can't do it on your own. If you could do it on your your own , you will not need faith - Rick Warren
How to live a godly dream?
1. They push you beyond your limitations
God told Abraham that he will be a father of nations in his 70s. God reminded Abraham again of his promise years later but Abraham still did not have children. The limitation is real but Abraham submitted to the limitations by having a child with Hagar. Only when he is 100 that Abraham became the father of Isaac, and later the nation of Israel.
2. They push you beyond yourself
King David focused on what he wanted which is to build a temple for God. The dream is not wrong but it is not what God wants. Since King David is not appointed to build the temple, he focused on preparing for the build - the gold, silver, bronze, ....
If the dream is from us, it may be myopic. But if the dream is from God, then we know it will go beyond us.
Now to him who is able to do immeasurably more than all we ask or imagine, according to his power that is at work within us...Eph 3:20