“For millions of years, mankind lived just like the animals. Then something happened which unleashed the power of our imagination. We learned to talk and we learned to listen. Speech has allowed the communication of ideas, enabling human beings to work together to build the impossible. Mankind's greatest achievements have come about by talking, and its greatest failures by not talking. It doesn't have to be like this. Our greatest hopes could become reality in the future. With the technology at our disposal, the possibilities are unbounded. All we need to do is make sure we keep talking.”

“Information is not knowledge. The only source of knowledge is experience. You need experience to gain wisdom.”

“Always obey your parents when they are present. This is the best policy in the long run, because if you don't, they will make you.”

“Genius is one percent talent and ninety-nine percent hard work.”

“When we see the Earth from space, we see ourselves as a whole. We see the unity, and not the divisions. It is such a simple image with a compelling message: one planet, one human race.”

“I'm not afraid of death, but I'm in no hurry to die.”

“One: remember to look up at the stars and not down at your feet. Two: never give up work; work gives you meaning and purpose and life is empty without it. Three: if you are lucky enough to find love, remember it is there and don't throw it away.”

“Learn from yesterday, live for today, hope for tomorrow.”

“Intelligence is the ability to adapt to change.”

“The best way to cheer yourself up is to try to cheer somebody else up.”

“Long live impudence! It's my guardian angel in this world.”

“When people do not respect us, we are sharply offended. Yet, in his private heart, no man respects himself much.”

“When in doubt, tell the truth.”

“Science is not only a disciple of reason but also one of romance and passion.”

“While there is life, there is hope.”

“Never argue with a fool; onlookers may not be able to tell the difference.”

“Nothing so needs reforming as other people's habits.”

“The universe does not behave according to our preconceived ideas. It continues to surprise us.”

“In less than a hundred years, we have found a new way to think of ourselves. From sitting at the center of the universe, we now find ourselves orbiting an average-sized sun, which is just one of millions of stars in our own Milky Way galaxy.”

“There is no vaccine against stupidity.”

“Love knows no barriers. It jumps hurdles, leaps fences, penetrates walls to arrive at its destination full of hope.”

“Only two things we'll regret on our deathbed: that we loved too little and traveled too little.”

“Do right, and you will be conspicuous.”

“One of the basic rules of the universe is that nothing is perfect. Perfection simply doesn't exist. Without imperfection, neither you nor I would exist.”

“All say, "How hard is it that we have to die?" A strange complaint, coming from the mouths of people who have had to live.”

“A person who never made a mistake never tried anything new.”

“Men will do many things to get themselves loved; they will do all things to get themselves envied.”

“Three rules of work: out of clutter find simplicity; from discord find harmony; in the middle of difficulty lies opportunity.”

“Noise proves nothing — often a hen who has laid an egg cackles as if she had laid an asteroid.”

“We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.”

“It matters if you just don't give up.”

“I believe in intuition and inspiration. At times, I feel certain I am right while not knowing the reason.”

“The most important days in your life are the day you are born and the day you find out why.”

“Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you too can become great.”

“Everyone is a moon, and has a dark side which he never shows to anybody.”

“A man should not be without morals; it is better to have bad morals than none at all.”

“Do something every day that you don't want to do. This is the golden rule for acquiring the habit of doing your duty without pain.”

“He who can no longer pause to wonder and stand rapt in awe is as good as dead; his eyes are closed.”

“We should seek the greatest value of our actions.”

“In my opinion, there is no aspect of reality beyond the reach of the human mind.”

“Isn't it funny how day by day nothing changes but when you look back, everything is different?”

“Education is what remains after one has forgotten what one has learned in school.”

“Love is a better teacher than duty.”

“Always acknowledge fault frankly; it will throw those in authority off guard and give you an opportunity to make a choice.”

“The human race has only one really effective weapon, and that is laughter.”

“That's one small step for a man, one giant leap for mankind.”

“The rate of progress is so rapid that what one learns at school or university is always a bit out of date. Only a few people can keep up with the rapidly advancing frontier of knowledge, and they have to devote their whole time to it and specialize in a small area. The rest of the population has little idea of the advances that are being made or the excitement they are generating.”

“An honest man in politics shines more than he would elsewhere.”

“The value of a man should be seen in what he gives and not in what he is able to receive.”

“Fear or stupidity has always been the basis of most human actions.”