Le mur murant Paris rend Paris murmurant.
The wall surrounding Paris is making Paris grumble.
Parisian saying after the Farmers-General of taxes, acting on a proposal by Lavoisier, erected a customs wall around Paris.

Post coitum omne animal triste.
After coition every animal is sad.

Post hoc, ergo propter hoc.
After this, therefore because of this.

Experiment adds to knowledge, Credulity leads to error.

Fiction tends to become 'fact' simply by serial passage via the printed page.

Garbage in, garbage out.

Half of the secret of resistance to disease is cleanliness; the other half is dirtiness.

Here are the opinions on which my facts are based.

Gnothi seauton.
Know thyself.

Laws of Thermodynamics
1) You cannot win, you can only break even.
2) You can only break even at absolute zero.
3) You cannot reach absolute zero.

Like the statistician who was drowned in a lake of average depth six inches.

Man occasionally stumbles on the truth, but then just picks himself up and hurries on regardless.

The most powerful antigen in human biology is a new idea.

Nature is by nature perverse.

A physicist learns more and more about less and less, until he knows everything about nothing; whereas a philosopher learns less and less about more and more, until he knows nothing about everything.

Nihil est in intellectu quod non prius fuerit in sensu.
There is nothing in the mind that has not previously been in the senses.

There is one thing stronger than all the armies in the world; and that is an idea whose time has come.

Hie locus est ubi mars gaudet succurere vitae.
This place is where death rejoices to come to the aid of life.

Magna opera Domini exquisita in omnes voluntates eius.
The works of the Lord are great; sought out of all those that have pleasure therein.

Give me a place to stand, and I will move the earth.

Experience is a comb that Nature gives man after he has gone bald.

Everybody loves a fat man.

It will never get well if you pick it.

Nobody loves a fat man.

Dauer in Wechsel.
Duration in change.

God created, Linnaeus ordered.

Temporis fila.
Child of time.
A favourite expression of Linnaeus.

The saying that a little knowledge is a dangerous thing is, to my mind, a very dangerous adage. If knowledge is real and genuine, I do not believe that it is other than a very valuable posession, however infinitesimal its quantity may be. Indeed, if a little knowledge is dangerous, where is a man who has so much as to be out of danger?

I think modern science should graft functional wings on a pig, simply so no one can ever use that stupid saying again.

It is open to every man to choose the direction of his striving; and also every man may draw comfort from Lessing's fine saying, that the search for truth is more precious than its possession.