Hope is itself a species of happiness and perhaps the chief happiness which this world affords.

There are three species of government: republican monarchical and despotic.

Heaven and hell suppose two distinct species of men the good and the bad. But the greatest part of mankind float betwixt vice and virtue.

The reproduction of mankind is a great marvel and mystery. Had God consulted me in the matter I should have advised him to continue the generation of the species by fashioning them out of clay.

At this early stage in our evolution now through our infancy and into our childhood and then with luck our growing up what our species needs most of all right now is simply a future.

I know a lot of people fear the rougher types who might be at a state school but surely it is better to know who they are and how to deal with them than for that kind of child to appear as a completely different species to yours.

Although we have in theory abolished human slavery recognized women's rights and stopped child labor we continue to enslave other species who if we simply pay attention show quite clearly that they experience parental love pain and the desire for freedom just as we do.

There are a lot of obstacles in the way of our understanding animal intelligence - not the least being that we can't even agree whether nonhuman species are conscious. We accept that chimps and dolphins experience awareness we like to think dogs and cats do. But what about mice and newts? What about a fly? Is anything going on there at all?

In a state therefore of great equality and virtue where pure and simple manners prevailed the increase of the human species would evidently be much greater than any increase that has been hitherto known.

There are two problems for our species' survival - nuclear war and environmental catastrophe - and we're hurtling towards them. Knowingly.

Mankind is considered (by the radical environmentalists) the lowest and the meanest of all species and is blamed for everything.

The Endangered Species Act is the strongest and most effective tool we have to repair the environmental harm that is causing a species to decline.

My childhood dreams were focused on being part of the effort to make humanity a multiplanetary species.

The very fact that we are having a national conversation about what we should eat that we are struggling with the question about what the best diet is is symptomatic of how far we have strayed from the natural conditions that gave rise to our species from the simple act of eating real whole fresh food.

Species go extinct because there are historical contraints built into a given body or a given design.

Let us beware of saying that death is the opposite of life. The living being is only a species of the dead and a very rare species.

What's happened with society is that we have created these devices computers which already can register and process huge amounts of information which is a significant fraction of the amount of information that human beings themselves as a species can process.

The damage that climate change is causing and that will get worse if we fail to act goes beyond the hundreds of thousands of lives homes and businesses lost ecosystems destroyed species driven to extinction infrastructure smashed and people inconvenienced.

It is not the strongest of the species that survives nor the most intelligent that survives. It is the one that is the most adaptable to change.

The human species according to the best theory I can form of it is composed of two distinct races the men who borrow and the men who lend.

Married people from my generation are like an endangered species!

Science is one of a handful of things that defines us as a very special species. It is amazing how far we have been able to get and how accurate our predictions are. I think understanding how the universe was born is very important. It really gives us a perspective on many things.

U2 is an original species... there are colours and feelings and emotional terrain that we occupy that is ours and ours alone.

All species capable of grasping this fact manage better in the struggle for existence than those which rely upon their own strength alone: the wolf which hunts in a pack has a greater chance of survival than the lion which hunts alone.