“For more than three thousand million years, DNA has been the only replicator worth talking about in the world. But it does not necessarily hold these monopoly rights for all time. Whenever conditions arise in which a new kind of replicator can make copies of itself, the new replicators will tend to take over, and start a new kind of evolution of their own.”

“Different sorts of survival machine appear very varied on the outside and in their internal organs. An octopus is nothing like a mouse, and both are quite different from an oak tree. Yet in their fundamental chemistry they are rather uniform, and, in particular, the replicators that they bear, the genes, are basically the same kind of molecule in all of us—from bacteria to elephants. We are all survival machines for the same kind of replicator—molecules called DNA— but there are many different ways of making a living in the world, and the replicators have built a vast range of machines to exploit them. A monkey is a machine that preserves genes up trees, a fish is a machine that preserves genes in the water; there is even a small worm that preserves genes in German beer mats. DNA works in mysterious ways.”

“Fear is like a weed in a garden. Once you allow it to take root, it spreads, replicating itself, until, eventually, it chokes out all the other life there. Trust, love, kindness – none of those things can ever really bloom in a garden of fear.”

“That was one of your favorite themes: that profusion, replication, popularity wasn't necessarily devaluing, and that time itself made all things rare. You loved to savor the present tense and were more conscious than anyone I have ever met that its every constituent is fleeting.”

“The choice in this life is not between easy and hard, but between kinds of hardship, between a hardship that gives birth to wisdom, compassion and mercy, and the hardship that keeps on replicating itself to no end.”

“Evolution itself embodies an ongoing exchange of information between organism and environment .... The gene has its cultural analog, too: the meme. In cultural evolution, a meme is a replicator and propagator — an idea, a fashion, a chain letter, or a conspiracy theory. On a bad day, a meme is a virus.”