When the first fossils began to be found in eastern Africa in the late 1950s I thought what a wonderful marriage this was biology and anthropology. I was around 16 years old when I made this particular choice of academic pursuit.

I am for gay marriage. Or same-sex marriage. I don't want to say it the wrong way. I think people are sensitive to it. I have been painted as being this right-wing zealot on choice. Nothing could be further from the truth.

You can't wake up one day and say 'I'm for gay marriage ' and wake up the next day and say 'I'm against it.' Wake up one day and say 'I'm pro-choice ' and the next day wake up and say 'I'm pro-life.' There's no credibility there.

Ultimately I believe the only secret to a happy marriage is choosing the right person. Life is a series of choices right?

I put my career in second place throughout both my marriages and it suffered. I don't regret it. You make choices. If you want a good marriage you must pay attention to that. If you want to be independent go ahead. You can't have it all.

For me working on the marriage and not making the easy choice of cheating was something that I could not do.

The real act of marriage takes place in the heart not in the ballroom or church or synagogue. It's a choice you make - not just on your wedding day but over and over again - and that choice is reflected in the way you treat your husband or wife.

Choose your love Love your choice.

You are doomed to make choices. This is life's greatest paradox.

Choice of attention - to pay attention to this and ignore that - is to the inner life what choice of action is to the outer. In both cases a man is responsible for his choice and must accept the consequences whatever they may be.