Daydreaming about something in order to do it properly is right, but daydreaming about it when we should be doing it is wrong. In this passage, after having said these wonderful things to His disciples, we might have expected our Lord to tell them to go away and meditate over them all. But Jesus never allowed idle daydreaming. When our purpose is to seek God and to discover His will for us, daydreaming is right and acceptable. But when our inclination is to spend time daydreaming over what we have already been told to do, it is unacceptable and God’s blessing is never on it. God will take the initiative against this kind of daydreaming by prodding us to action. His instructions to us will be along the lines of this: “Don’t sit or stand there, just go!”
If we are quietly waiting before God after He has said to us, “Come aside by yourselves . . .” then that is meditation before Him to seek His will (Mark 6:31). Beware, however, of giving in to mere daydreaming once God has spoken. Allow Him to be the source of all your dreams, joys, and delights, and be careful to go and obey what He has said. If you are in love with someone, you don’t sit and daydream about that person all the time—you go and do something for him. That is what Jesus Christ expects us to do. Daydreaming after God has spoken is an indication that we do not trust Him.
Taken from “My Utmost For His Highest”