“Difference of opinion is advantageous in religion. The several sects perform the office of a Censor morum over each other. Is uniformity attainable? Millions of innocent men, women, and children, since the introduction of Christianity, have been burnt, tortured, fined, imprisoned; yet we have not advanced one inch towards uniformity. What has been the effect of coercion? To make one half the world fools, and the other half hypocrites. To support roguery and error all over the earth. Let us reflect that it is inhabited by a thousand millions of people. That these profess probably a thousand different systems of religion. That ours is but one of that thousand. That if there be but one right, and ours that one, we should wish to see the 999 wandering sects gathered into the fold of truth. But against such a majority we cannot effect this by force. Reason and persuasion are the only practicable instruments. To make way for these, free enquiry must be indulged; and how can we wish others to indulge it while we refuse it ourselves.”

“More we know more we know our ignorance. Darkness can be perceived with the help of light.Facts are stranger than fiction.Have you ever thought why there are many religions and there is only one science on the Earth? Devotees of different religions follow different customs, rituals, prayers, attributes of gods, etc. Each religion has many sects; these sects are further divided as per the geographical locations of the devotees. Thus, religious concepts of different people are altogether different. For example, people of one religion sacrifice animals to appease their gods; whereas, people of other religion appease their gods through the service of those animals. To take another example, the idol worship is core of one religion; whereas, the other religion has imposed a taboo over idol worship. One can say that this discrepancy among religions is due to the fact that religions originated in different geographical locations. Not only religions, science was also conceived by the scientists of diverse origin. However, all those unconnected scientists discovered exactly similar scientific principles. Have you ever heard Indian science, British science, or American science? All over the world, many pioneer scientists discovered their principles and later other scientists attested those. If some principle was found incorrect, soon its inventor accepted the truth. There is one concrete reason behind existence of many religious concepts and only one science on the Earth. About one thing or concept, there is only one truth but there can be many lies.”

“In this way, Edwin Hubble worked out the distances to nine different galaxies. We now know that our galaxy is only one of some hundred thousand million that can be seen using modern telescopes, each galaxy itself containing some hundred thousand million stars.”

“Once we stop looking at each other as colors and simply as men and women we can begin to look at our similarities that makes us all human rather than looking at our differences to separate us further. You do not see different species of birds attacking each other cause one is a sparrow and the other is a pigeon.”

“I myself have dreamed up a structure intermediate between Dyson spheres and planets. Build a ring 93 million miles in radius - one Earth orbit - around the sun. If we have the mass of Jupiter to work with, and if we make it a thousand miles wide, we get a thickness of about a thousand feet for the base.And it has advantages. The Ringworld will be much sturdier than a Dyson sphere. We can spin it on its axis for gravity. A rotation speed of 770 m/s will give us a gravity of one Earth normal. We wouldn't even need to roof it over. Place walls one thousand miles high at each edge, facing the sun. Very little air will leak over the edges.Lord knows the thing is roomy enough. With three million times the surface area of the Earth, it will be some time before anyone complains of the crowding.”

“When we see religion split into so many thousand of sects, and I may say Christianity itself divided into its thousands also, who are disputing, anathematizing and where the laws permit burning and torturing one another for abstractions which no one of them understand, and which are indeed beyond the comprehension of the human mind, into which of the chambers of this Bedlam would a man wish to thrust himself.[Letter to George Logan, 12 November 1816]”