One of the possible reasons ...

One of the possible reasons why we might be good is that we\'re frightened, frightened of God. We want the reward in Heaven, we don\'t want to go to Hell. That would be an ignoble, ignominious reason for being good, and I think that if anybody was good to you just because they hoped for a heavenly reward, you wouldn\'t respect them, you\'d probably give them a wide berth.
One of the possible reasons why we might be good is that we're frightened, frightened of God. We want the reward in Heaven, we don't want to go to Hell. That would be an ignoble, ignominious reason for being good, and I think that if anybody was good to you just because they hoped for a heavenly reward, you wouldn't respect them, you'd probably give them a wide berth.
 Richard Dawkins

Quotes from the same author

That there is a continuous link from humans to gorillas, with the intermediate species merely long dead, is beyond the understanding of speciesists. Tie the label Homo sapiens even to a tiny piece of insensible embryonic tissue, and its life suddenly leaps to infinite, incomputable value.... Self-styled pro-lifers, and others that indulge in footling debates about exactly when in its development a foetus becomes human, exhibit the same discontinuous mentality. Human, to the discontinuous mind, is an absolutist concept. There can be no half measures. And from this flows much evil.
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 Richard Dawkins
I think there is a sort of box-ticking mentality. Not just in the teaching profession. You hear about it in medicine and nursing. It's a lawyer-driven insistence on meeting prescribed standards rather than just being a good doctor.
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 Richard Dawkins
I think that's the mother and father of all cop-outs. It's an honest scientific quest to discover where this apparent improbability comes from. Now [Francis] Collins says, "Well, God did it. And God needs no explanation because God is outside all this." Well, what an incredible evasion of the responsibility to explain. Scientists don't do that. Scientists say, "We're working on it. We're struggling to understand.
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 Richard Dawkins
How any government could promote the Vardy academies in the North-East of England is absolutely beyond me. Tony Blair defends them on grounds of diversity, but it should be unthinkable in the 21st century to have a school whose head of science believes the world is less than 10,000 years old.
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 Richard Dawkins
Intelligent life on a planet comes of age when it first works out the reason for its own existence.
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 Richard Dawkins