You have to know the past to understand the present.

Quote by Dr Carl Sagan

Topics: History Quotes, Past Quotes, Understanding Quotes

In science it often happens that scientists say, 'You know that's a really good argument;...

In science it often happens that scientists say, 'You know that's a really good argument;...

All of the books in the world contain no more information than is broadcast as...

All of the books in the world contain no more information than is broadcast as...

All of the books in the world contain no more information than is broadcast as...

All of the books in the world contain no more information than is broadcast as...

The surface of the Earth is the shore of the cosmic ocean. From it we...

The surface of the Earth is the shore of the cosmic ocean. From it we...

If we long to believe that the stars rise and set for us, that we...

If we long to believe that the stars rise and set for us, that we...

That's here. That's home. That's us. On it everyone you love, everyone you know, everyone...

That's here. That's home. That's us. On it everyone you love, everyone you know, everyone...

A religion old or new, that stressed the magnificence of the universe as revealed by...

A religion old or new, that stressed the magnificence of the universe as revealed by...

I am often amazed at how much more capability and enthusiasm for science there is...

I am often amazed at how much more capability and enthusiasm for science there is...

True human progress, that which can be linked to evolution, and which prolongs it, can...

True human progress, that which can be linked to evolution, and which prolongs it, can...

... the use of our intelligence quite properly gives us pleasure. In this respect the...

... the use of our intelligence quite properly gives us pleasure. In this respect the...

We've arranged a civilization in which most crucial elements profoundly depend on science and technology.

We've arranged a civilization in which most crucial elements profoundly depend on science and technology.

There are many hypotheses in science which are wrong. That's perfectly all right; they're the...

There are many hypotheses in science which are wrong. That's perfectly all right; they're the...

I also wish that the Pledge of Allegiance were directed at the Constitution and the...

I also wish that the Pledge of Allegiance were directed at the Constitution and the...

I maintain there is much more wonder in science than in pseudoscience. And in addition,...

I maintain there is much more wonder in science than in pseudoscience. And in addition,...

If we long to believe that the stars rise and set for us, that we...

If we long to believe that the stars rise and set for us, that we...

Personally, I would be delighted if there were a life after death, especially if it...

Personally, I would be delighted if there were a life after death, especially if it...

Our loyalties are to the species and the planet. We speak for Earth. Our obligation...

Our loyalties are to the species and the planet. We speak for Earth. Our obligation...

A religion old or new, that stressed the magnificence of the universe as revealed by...

A religion old or new, that stressed the magnificence of the universe as revealed by...

It is written, Man shall not live by bread alone, but by every word that...

It is written, Man shall not live by bread alone, but by every word that...

I am treated as evil by people who claim that they are being oppressed because...

I am treated as evil by people who claim that they are being oppressed because...