The world is nothing but change, our life is only perception.

Do what you will. Even if you tear yourself apart, most people will continue doing the same things.

In the morning, when you are sluggish about getting up, let this thought be present: 'I am rising to a man's work.'

Bear in mind that the measure of a man is the worth of the things he cares about.

I am called to man's labour; why then do I make a difficulty if I am going out to do what I was born to do and what I was brought into the world for?

From Alexander the Platonic, not frequently nor without necessity to say to any one, or to write in a letter, that I have no leisure; nor continually to excuse the neglect of duties required by our relation to those with whom we live, by alleging urgent occupations.

From the philosopher Catulus, never to be dismissive of a friend's accusation, even if it seems unreasonable, but to make every effort to restore the relationship to its normal condition.