Perception starts with the eye.

Life is only meaningful when we are striving for a goal .

Some men are just as sure of the truth of their opinions as are others of what they know.

The saying of Protagoras is like the views we have mentioned; he said that man is the measure of all things, meaning simply that that which seems to each man assuredly is. If this is so, it follows that the same thing both is and is not, and is bad and good, and that the contents of all other opposite statements are true, because often a particular thing appears beautiful to some and ugly to others, and that which appears to each man is the measure

All men naturally desire knowledge. An indication of this is our esteem for the senses; for apart from their use we esteem them for their own sake, and most of all the sense of sight. Not only with a view to action, but even when no action is contemplated, we prefer sight, generally speaking, to all the other senses. The reason of this is that of all the senses sight best helps us to know things, and reveals many distinctions.

To appreciate the beauty of a snow flake, it is necessary to stand out in the cold.

I count him braver who overcomes his desires than him who conquers his enemies; for the hardest victory is over self.