The constant recollection of death is the test of human conduct.
How ridiculous and how strange to be surprised at anything which happens in life
A man must stand erect, not be kept erect by others.
Search men's governing principles, and consider the wise, what they shun and what they cleave to.
Treat with utmost respect your power of forming opinions, for this power alone guards you against making assumptions that are contrary to nature and judgments that overthrow the rule of reason.
Nature which governs the whole will soon change all things which you see, and out of their substance will make other things and again other things... in order that the world may be ever new.