You don't know what you don't know.

I desire only to know the truth, and to live as well as I can...And, to the utmost of my power, I exhort all other men to do the same...I exhort you also to take part in the great combat, which is the combat of life, and greater than every other earthly conflict.

How many things are there which I do not want.

And I say let a man be of good cheer about his soul. When the soul has been arrayed in her own proper jewels - temperance and justice, and courage, and nobility and truth - she is ready to go on her journey when the hour comes.

Is there anyone to whom you entrust a greater number of serious matters than your wife? And is there anyone with whom you have fewer conversations?

When you want success as badly as you want the air, then you will get it. There is no other secret of success.

The first key to greatness is to be in reality what we appear to be.