Actually it is quite devastating to realise how few people ever think at all. They mostly take their ideas from what they are told on the wireless, television, or in the newspapers, from people who are prepared to take a reasonable fee. To suggest anything different makes you tread on many corns of vested interest. No professional pathfinder likes you for doing it.

It is reasonable to love the Absolute absolutely for the same reason it is reasonable to love the relative relatively.

Nothing sweeter than to drag oneself along behind events; and nothing more reasonable. But without a strong dose of madness, no initiative, no enterprise, no gesture. Reason: the rust of our vitality. It is the madman in us who forces us to adventure; once he abandons us, we are lost; everything depends on him, even our vegetative life; it is he who invites us, who obliges us to breathe, and it is also he who forces our blood to venture through our veins. Once he withdraws, we are alone indeed! We cannot be normal and alive at the same time.

It is pointless to ask: Why then is sex so secret? What is this force that so long reduced it to silence and has only recently relaxed its hold somewhat, allowing us to question it perhaps, but always in the context of and through its repression? In reality, this question, so often repeated nowadays, is but the recent form of a considerable affirmation and a secular prescription: there is where the truth is; go see if you can uncover it. [...] It is reasonable therefore to ask first of all: What is this injunction? Why this great chase after the truth of sex, the truth in sex?

It is closer to the truth to say that God is crazy than that God is reasonable. I suspect God merely smiles when someone calls him crazy, but shakes His head and frowns when someone calls Him reasonable.

From the philosopher Catulus, never to be dismissive of a friend's accusation, even if it seems unreasonable, but to make every effort to restore the relationship to its normal condition.

Is there any knowledge in the world which is so certain that no reasonable man could doubt it?

But there is in everything a reasonable division of labour. I have written the book, and nothing on earth would induce me to read it.

You called me at four thirty-four....I hate four thirty-four. I think four thirty-four should be banned and replaced with something more reasonable, like, say, nine twelve.

Atheism is not a philosophy; it is not even a view of the world; it is simply an admission of the obvious. In fact, 'atheism' is a term that should not even exist. No one needs to identify himself as a 'non-astrologer' or a 'non-alchemist.' We do not have words for people who doubt that Elvis is still alive or that aliens have traversed the galaxy only to molest ranchers and cattle. Atheism is nothing more than the noises reasonable people make in the presence of unjustified religious beliefs.

Let's be reasonable and add an eighth day to the week that is devoted exclusively to reading.

So now you must choose... Are you a child who has not yet become world-weary? Or are you a philosopher who will vow never to become so? To children, the world and everything in it is new, something that gives rise to astonishment. It is not like that for adults. Most adults accept the world as a matter of course. This is precisely where philosophers are a notable exception. A philosopher never gets quite used to the world. To him or her, the world continues to seem a bit unreasonable - bewildering, even enigmatic. Philosophers and small children thus have an important faculty in common. The only thing we require to be good philosophers is the faculty of wonder?

The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.

Love is an endless mystery, because there is no reasonable cause that could explain it.

"It's not reasonable to love people who are only going to die," she said.

How can I be reasonable? To me our love was everything and you were my whole life. It is not very pleasant to realize that to you it was only an episode.

What you say about this world I do not quite agree with I think it a very good world and only requires a person to be reasonable in his expectations and not to trust too much to others.

Make measurable progress in reasonable time.

I'm in favor of any technology that makes my work available to the reading public at a reasonable price.

You had no right to be born for you make no use of life. Instead of living for in and with yourself as a reasonable being ought you seek only to fasten your feebleness on some other person's strength.

It is very reasonable to worry about the harm done by organized religion and to prefer looser and more private arrangements.

The Christian religion not only was at first attended with miracles but even at this day cannot be believed by any reasonable person without one.

It does not seem to me that the steps which would be needed to make Britain - and others - more comfortable in their relationship in the European Union are inherently so outlandish or unreasonable.

The overall view of the human genome project has been one of great excitement and positive press but there are people who have concerns that are quite reasonable and they are frightened of things they don't understand.