Heraclitus of Ephesus (c. 535 – c. 475 BC) was a pre-Socratic Greek philosopher, and a native of the city of Ephesus. Heraclitus was famous for his insistence on ever-present change as being the fundamental essence of the universe, as stated in the famous saying, "No man ever steps in the same river twice". This position was complemented by his stark commitment to a unity of opposites in the world, stating that "the path up and down are one and the same". 

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The chain of wedlock is so heavy that it takes two to carry it - and sometimes three.

No one that encounters prosperity does not also encounter danger.

Character is destiny.

Even sleepers are workers and collaborators in what goes on in the Universe.

Hide our ignorance as we will an evening of wine soon reveals it.

Nothing endures but change.

Men who wish to know about the world must learn about it in its particular details.

Deliberate violence is more to be quenched than a fire.

You could not step twice into the same rivers, for other waters are ever flowing on to you.

Change alone is unchanging.

Good character is not formed in a week or a month. It is created little by little day by day. Protracted and patient effort is needed to develop good character.

Opposition brings concord. Out of discord comes the fairest harmony.

The way up and the way down are one and the same.

Couples are wholes and not wholes what agrees disagrees the concordant is discordant. From all things one and from one all things.

I am what libraries and librarians have made me with little assistance from a professor of Greek and poets.

Much learning does not teach understanding.

You cannot step into the same river twice.

To do the same thing over and over again is not only boredom: it is to be controlled by rather than to control what you do.

Our envy always lasts longer than the happiness of those we envy.

Bigotry is the sacred disease.

The eyes are more exact witnesses than the ears.

A man's character is his fate.

Corpses are more fit to be thrown out than is dung.

Man is most nearly himself when he achieves the seriousness of a child at play.

It is hard to contend against one's heart's desire, for whatever it wishes to have it buys at the cost of soul.

To God everything is beautiful good and just, humans however think some things are unjust and others just.

If you do not expect the unexpected you will not find it for it is not to be reached by search or trail.

Nature is wont to hide herself.

God is day and night winter and summer war and peace surfeit and hunger.

A man's character is his guardian divinity.

Justice will overtake fabricators of lies and false witnesses.

The sun is new each day.

Eyes and ears are poor witnesses to people if they have uncultured souls.

There is nothing permanent except change.

No man ever steps in the same river twice for it's not the same river and he's not the same man.

The best people renounce all for one goal the eternal fame of mortals, but most people stuff themselves like cattle.

Big results require big ambitions.