To believe something in the face of evidence and against reason - to believe something by faith - is ignoble, irresponsible and ignorant, and merits the opposite of respect.

Try lighting your house by prayer instead of electricity and see which one works.

Nothing is truly unnatural, because everything that exists, including human intelligence, is a product of nature. If human intelligence can devise ways for the genes from two men to result in a child, their doing so is an entirely natural event.

A human lifespan is less than a thousand months long. You need to make some time to think how to live it.

Socrates famously said that the unconsidered life is not worth living. He meant that a life lived without forethought or principle is a life so vulnerable to chance, and so dependent on the choices and actions of others, that it is of little real value to the person living it. He further meant that a life well lived is one which has goals, and integrity, which is chosen and directed by the one who lives it, to the fullest extent possible to a human agent caught in the webs of society and history.

Religious apologists complain bitterly that atheists and secularists are aggressive and hostile in their criticism of them. I always say: look, when you guys were in charge, you didn't argue with us, you just burnt us at the stake. Now what we're doing is, we're presenting you with some arguments and some challenging questions, and you complain.

Nowadays, by contrast, Christianity specialises in soft-focus mood music; its threats of hell, its demand for poverty and chastity, its doctrine that only the few will be saved and the many damned, have been shed, replaced by strummed guitars and saccharine smiles. It has reinvented itself so often, and with such breathtaking hypocrisy, in the interests of retaining its hold on the gullible, that a medieval monk who woke today, like Woody Allen's Sleeper, would not be able to recognise the faith that bears the same name as his own.