Pythagoras of Samos (c. 570 – c. 495 BC) ancient Ionian Greek philosopher and the eponymous founder of Pythagoreanism. 

Some are slaves of ambition or money, but others are interested in understanding life itself. These give themselves the name philosophers, and they value the contemplation and discovery of nature beyond all other pursuits.
Do not take roads traveled by the public.
No man should quit his post but at the command of his General; that is, of God himself.
Meaningful silence is better than meaningless words.
As long as man continues to be the ruthless destroyer of lower living beings, he will never know health or peace. For as long as men massacre animals, they will kill each other.
Every triangle is a love triangle if you love triangles.
There are men and gods, and beings like Pythagoras.
He lived far from the gods, but in his mind he was at home with them.
As soon as you awake, in order lay the actions to be done the coming day.
Ability and necessity dwell near each other.
Should one in boldness say, Lo, I am God! Besides the One--Eternal--Infinite, Then let him from the throne he has usurped Put forth his power and form another globe, Such as we dwell in, saying, This is mine. Nor only so, but in this new domain For ever let him dwell. if this he can, Then verily he is a god proclaimed.
Power is the near neighbour of necessity.
There is geometry in the humming of the string.
Thought is an Idea in transit, which when once released, never can be lured back, nor the spoken word recalled. Nor ever can the overt act be erased.
It is difficult to walk at one and the same time many paths of life.
Allow not sleep to close your eyes Before three times reflecting on Your actions of the day. What deeds Done well, what not, what left undone?
You should make great things, not promising great things.
Souls never die, but always on quitting one abode pass to another. All things change, nothing perishes. The soul passes hither and thither, occupying now this body, now that... As a wax is stamped with certain figures, then melted, then stamped anew with others, yet it is always the same wax. So, the Soul being always the same, yet wears at different times different forms.
Practice justice in word and deed, and do not get in the habit of acting thoughtlessly about anything.
Friends are as companions on a journey, who ought to aid each other to persevere in the road to a happier life.
A blow from your friend is better than a kiss from your enemy.
Anger begins in folly, and ends in repentance.
Friends share all things.
Choose always the way that seems the best, however rough it may be; custom will soon render it easy and agreeable.
We ought so to behave to one another as to avoid making enemies of our friends, and at the same time to make friends of our enemies.
As soon as laws are necessary for men, they are no longer fit for freedom.
Declining from the public ways, walk in unfrequented paths.
Number rules the universe.
It is only necessary to make war with five things; with the maladies of the body, the ignorances of the mind, with the passions of the body, with the seditions of the city and the discords of families.
All is Number.