The real voyage of discovery consists not in seeking new landscapes, but in having new eyes.
It is the mark of an educated mind to be able to entertain a thought without accepting it.
Your vision will become clear only when you can look into your own heart. Who looks outside, dreams; who looks inside, awakes.
The optimist sees opportunity in every danger; the pessimist sees danger in every opportunity.
The moment you change your perception is the moment you rewrite the chemistry of your body.
There are things known and there are things unknown, and in between are the doors of perception.