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I have to be seen to be believed.

Seeing is not always believing.

You have to imagine it possible before you can see something. You can have the evidence right in front of you, but if you can't imagine something that has never existed before, it's impossible.

You must first clearly see a thing in your mind before you can do it.

To believe with certainty we must begin with doubting.

Believe half of what you see and only some of what you hear, unless you hear it from me.

You need to believe in yourself.