I believe in the power of the mind. It is that which has changed the world. The thoughts of men has changed the world but only when they were let out.
The world was still in darkness when Thomas Alva Edison thought of the light bulb. His thoughts never changed the world bottled up; he had to "unbottle" it.
The world could only imagine humans flying but the Wright brothers made thier imaginations tangible and that was when the world of aviation began.
In your mind is a world changing thought or idea, do not bottle up it up. You'll never know how it could change the world.