The current state of knowledge is a moment in history changing just as rapidly as the state of knowledge in the past has ever changed and in many instances more rapidly.

A year is an eternity in politics - though less than a moment in history.

If I were beginning my career today I don't think I would take the same direction. Television is at a crossroads at the moment. And although I am not up to date technologically I suspect that somewhere out there people are conveying things about natural history by means other than television and I think if I were beginning today I'd be there.

Man's naked form belongs to no particular moment in history it is eternal and can be looked upon with joy by the people of all ages.

There are certain moments in the history of a nation when the choices made define the decades to come.

There is a spirit and a need and a man at the beginning of every great human advance. Every one of these must be right for that particular moment of history or nothing happens.

In history as in human life regret does not bring back a lost moment and a thousand years will not recover something lost in a single hour.

In a sense words are encyclopedias of ignorance because they freeze perceptions at one moment in history and then insist we continue to use these frozen perceptions when we should be doing better.

This is a moment in history where it is almost hard to catch your breath.

September 11th was a moment when America had the sympathy of the world.

There is nothing new about these Republican attacks on our family planning decisions. In fact from the moment they came into power Republicans in the House of Representatives have been waging a war on women's health.

Think for a moment about what Obamacare has done: The federal government has come up with its own (ever-evolving) definition of 'health insurance ' which now includes free access to sterilization contraception and certain abortifacients such as the morning-after pill.

This is a historic moment in global public health demonstrating the international will to tackle a threat to health head on.

I'm always active in trying to educate people when it comes to eating animal products testing on animals and the health benefits of being vegan although I'm probably not the best person to be talking about the latter at the moment.

I had my moments when I got very frightened that I would not recover.

I can only point out a curious fact. Year after year the Nobel Awards bring a moment of happiness not only to the recipients not only to colleagues and friends of the recipients but even to strangers.

Happiness is the sublime moment when you get out of your corsets at night.

When I first found out that I was an Idol finalist I cried tears of happiness. I was just so happy and my family was there and the fact that got to see that moment and share that moment with me was just everything to me.

Every moment of your life that is not a complete nightmare is happiness.

I find happiness comes from numerous sources in my life. Most often the happy moments I cherish most are quiet moments with my wife and family back home in Nova Scotia.

One of my producers said this business is like a hamster on that little wheel thing that goes around and around. You may have a great day and get great ratings but then you've got another show to do - whatever moment of success or happiness you have you've got to keep grinding it out for the next day.

I have my moments. Ever since I was a boy I never was someone who was at ease with happiness. Too often I embrace introspection and self-doubt. I wish I could embrace the good things.

Happiness is nothing but temporary moments here and there - and I love those. But I would be bored out of my mind if I were happy all the time.

When a small child I thought that success spelled happiness. I was wrong happiness is like a butterfly which appears and delights us for one brief moment but soon flits away.