Karl Popper Quotes

All that we know is still infinitely less than all that still remains unknown.

The case for individual freedom rests largely on the recognition of the inevitable and universal ignorance of all of us concerning a great many of the factors on which the achievements of our ends and welfare depend.

Of course, mankind has made giant steps forward. However, what we know is really very, very little compared to what we still have to know.

Indeed, the most important product of knowledge is ignorance.

You can't know what you don't know. You can't know about things you have yet to discover.

While some of us may know than others about certain things, it is the thinnest slice of all that is, or could be known. In that sense, we are all profoundly ignorant.

Our ignorance will always remain greater than our knowledge.

I like the fact that the weather forecast is always wrong. In a world of BlackBerry insta-connection, Google research, and Hadron Colliders, it is a daily reminder of the ultimate ignorance of man. It is a signpost towards all the enormous things we cannot understand.

How imperfect is all our knowledge!

Nature is all that we think we know plus all that we don't know whether or not we know that we don't know it.

All that mankind has ever learned is nothing more than a single grain of sand on a beach that reaches to infinity.

There has been an alarming increase in the number of things you know nothing about.

The first and wisest of them all professed To know this only, that he nothing knew.

We know less when we erroneously think we know than when we recognize that we don't.

We know no more than we did in 1975 - and that's not good

Live free, child of the mist,- and with respect to knowledge we are allchildren of the mist.

It is little enough we know and the rest is darkness.

It is not permitted that we should know everything.

Ignorance lies at the bottom of all human knowledge, and the deeper we penetrate, the nearer we arrive unto it.

I don't think it's meant for man to know everything at once.

The end of man is knowledge, but there is one thing he can't know. He can't know whether knowledge will save him or kill him. He will be killed, all right, but he can't know whether he is killed because of the knowledge which he has got or because of the knowledge which he hasn't got and which if he had it, would save him.

Science's job is to map our ignorance.

Whatever torch we kindle, and whatever space it may illuminate, our horizon will always remain encircled by the depth of night.

Sometimes I feel like a beetle crawling through a fusion power plant. I can feel a certain amount, see a certain amount, but I sure as hell don't understand everything.

The greatest of all the accomplishments of 20th century science has been the discovery of human ignorance