Carl Sagan Quotes

But down deep, at the molecular heart of life we're essentially identical to trees.

We are not humans because we've invented a different type of brain cell, a different type of brain chemical. We are the same basic building blocks as even a fruit fly.

Knowing without seeing is at the heart of chemistry.

You've got to just follow your heart and do your best work. For better or worse, I have followed my heart. There is no doubt in my mind or heart that everything I've done is exactly what I intended to do.

When the heart is flooded with love there is no room in it for fear, for doubt, for hesitation.

When you want it the most, there's no easy way out.When you're ready to go, and your heart's left in doubt. Don't give up on your faith, love comes to those who believe it...And that's the way it is.

And yet and yet - the last secret of the tree of codes is that nothing can ever reach a definite conclusion. Nowhere as much as there do we feel possibilities shaken by the nearness of realization. The atmosphere becomes possibilities and we shall wander and make a thousand mistakes. We shall wander along yet not be able to understand.

I look'd to Heav'n, and try'd to pray; But or ever a prayer had gusht, A wicked whisper came and made My heart as dry as dust.

The moment you stop to think about whether you love someone, you've already stopped loving that person forever.

Ah. In my experience, when people say they don't know whether they love someone, they usually mean no.

I like to take the time out to listen to the trees, much in the same way that I listen to a sea shell, holding my ear against the rough bark of the trunk, hearing the inner singing of the sap. It's a lovely sound, the beating of the heart of the tree.

Atheism is rather in the lip, than in the heart of man.

But I hadn't known what love was. And I wondered how you could ever be sure, when you thought you loved someone, if you really did.

The month of May was come, when every lusty heart beginneth to blossom, and to bring forth fruit; for like as herbs and trees bring forth fruit and flourish in May, in likewise every lusty heart that is in any manner a lover, springeth and flourisheth in lusty deeds. For it giveth unto all lovers courage, that lusty month of May.

If on the other hand he went to pay his respects to The Door and it wasn't there . . . what then? The answer, of course, was very simple. He had a whole board of circuits for dealing with exactly this problem, in fact this was the very heart of his function. He would continue to believe in it whatever the facts turned out to be, what else was the meaning of Belief? The Door would still be there, even if the Door was not.

Haemoglobin is a very large molecule by ordinary standards, containing about ten thousand atoms, but the chances are that your haemoglobin and mine are identical, and significantly different from that of a pig or horse. You may be impressed by how much human beings differ from one another, but if you were to look into the fine details of the molecules of which they are constructed, you would be astonished by their similarity.

Anything you say from your heart to God is a prayer. But "why" is rarely a useful question. When Job keeps asking God why he has had such loss and suffering, God says, "You wouldn't understand." I always want to know why, and I almost never have a good answer.

I understood all that in my head, but I still didn‟t believe it in my heart.

I got comments about being too small, too short, there haven't been any Asian players and who am I to go out there and turn pro before my 16th birthday? And that's all good and fine. People want to have their comments and their opinions. Ultimately, you do what you believe in your heart. I think for me, things turned out OK.

Our heart wanders lost in the dark woods. Our dream wrestles in the castle of doubt. But there’s music in us. Hope is pushed down but the angel flies up again taking us with her.

The beauty of a living thing is not the atoms that go into it, but the way those atoms are put together. Information distilled over 4 billion years of biological evolution. Incidentally, all the organisms on the Earth are made essentially of that stuff. An eyedropper full of that liquid could be used to make a caterpillar or a petunia if only we knew how to put the components together.

Noble hearts are neither jealous nor afraid because jealousy spells doubt and fear spells pettiness.

While forced to dwell apart from thy dear face, Love, robed like sorrow, led me by the hand And taught my doubting heart to understand That which has puzzled all the human race.

This mind is the doubting mind, and in the doubting mind we can never feel the presence of peace. We can feel the presence of peace only in the loving heart.

When you find your purpose, it is like your heart has been set alight with passion. You know it absolutely, without any doubt.