You have to know the past to understand the present.

Quote by Dr Carl Sagan

Topics: History Quotes, Past Quotes, Understanding Quotes

It is of interest to note that while some dolphins are reported to have learned...

It is of interest to note that while some dolphins are reported to have learned...

When Kepler found his long-cherished belief did not agree with the most precise observation, he...

When Kepler found his long-cherished belief did not agree with the most precise observation, he...

It is far better to grasp the Universe as it really is than to persist...

It is far better to grasp the Universe as it really is than to persist...

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...

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...

I worry that, especially as the Millennium edges nearer, pseudo-science and superstition will seem year...

I worry that, especially as the Millennium edges nearer, pseudo-science and superstition will seem year...

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,...

The brain is like a muscle. When it is in use we feel very good....

The brain is like a muscle. When it is in use we feel very good....

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...

The Universe forces those who live in it to understand it. Those creatures who find...

The Universe forces those who live in it to understand it. Those creatures who find...

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...

You can't convince a believer of anything; for their belief is not based on evidence,...

You can't convince a believer of anything; for their belief is not based on evidence,...

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 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...

Science is a way of thinking much more than it is a body of knowledge.

Science is a way of thinking much more than it is a body of knowledge.

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.

The defiance of established authority, religious and secular, social and political, as a world-wide phenomenon...

The defiance of established authority, religious and secular, social and political, as a world-wide phenomenon...

As far as I'm concerned, I prefer silent vice to ostentatious virtue.

As far as I'm concerned, I prefer silent vice to ostentatious virtue.

Be civil to all; sociable to many; familiar with few.

Be civil to all; sociable to many; familiar with few.

Don't confuse the art of the possible with the art of the profitable.

Don't confuse the art of the possible with the art of the profitable.