He who would be tranquil should not undertake too many things, either private or public.
ho boulos euthymeein me polla presseito mete idie mete xynie.

Philosophers
Democritus
Born around 460 BCE in Abdera, Thrace, Democritus was an ancient Greek natural philosopher who, together with his teacher Leucippus, proposed that the fundamental constituents of reality are 'atoms' (indivisible particles) and 'void' (empty space). Known as 'the laughing philosopher,' his ethical vision locating human happiness in euthymia (tranquility of mind) was carried forward by Epicurus.
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Democritus's Other Quotes
Color exists by convention, sweet by convention, bitter by convention; in reality there are only atoms and void.
Tranquility arises for human beings from moderation in enjoyment and a balanced life.
For those who want more, time is never enough.
Courage begins the difficult deed, but fortune governs its outcome.
Related Quotes
As in all things, we suffer from excess in reading too. Many books are a burden, not an ornament.
-- Seneca
The unexamined life is not worth living.
-- Socrates
It is not living that matters, but living rightly.
-- Socrates
Live unknown.
-- Epicurus
The pleasant life is produced not by endless drinking and revelry but by sober reasoning.
-- Epicurus
Tranquility arises for human beings from moderation in enjoyment and a balanced life.
-- Democritus