The most glorious moments in your life are not the so-called days of success, but rather those days when out of dejection and despair you feel rise in you a challenge to life, and the promise of future accomplishments.

There is never time in the future in which we will work out our salvation. The challenge is in the moment; the time is always now.

Comedians have to challenge the power. Comedians should be dangerous and devastating - and funny. That's the hardest part.

Yet there are some people - Steve Allen would dissect comedy forever; he's a really funny guy, but he would love talking about comedy. I'm doing it right now and you all seem bored.

I went to the University of San Francisco on an athletic scholarship. I didn't study in high school. I was just there to get by and to play basketball. But a funny thing happened to me when I got to college. I got challenged by the work and the professors.

One of my best friendships dwindled in the pub business - we still talk, but it challenged that friendship too much - and that taught me to go into football and find people that I can have good relations with but without being overly friendly.

'Mistresses' is about the lives of four women, each going through different versions of infidelity. Their longtime friendship is what gets them through extremely challenging times.

I'm calling my book series the 'with God series.' And this next 'with God' book is Friendship with God, which comes out in November. This books challenges us to bring about the end of 'better' on this planet.

I think ageing is challenging, surprising, fun, and full of friendship, so that is the approach I'll take, objecting to the stigmatization of ageing in so many modern societies.

It's always really challenging trying to go from player to player/coach. You have a kind of friendship basis of relationship with all of your teammates, and now you go to this power position where you have to make decisions that might hurt people's feelings.

Our single most important challenge is therefore to help establish a social order in which the freedom of the individual will truly mean the freedom of the individual.

As a 22-year Army Veteran who served in Operations Desert Storm and Iraqi Freedom, and as a Civilian Advisor to the Afghan Army in Operation Enduring Freedom, I understand both the gravity of giving the order, and the challenge of carrying it out.

Pervading nationalism imposes its dominion on man today in many different forms and with an aggressiveness that spares no one. The challenge that is already with us is the temptation to accept as true freedom what in reality is only a new form of slavery.

The more dollars the studio producers put in, the less freedom we have. If the budget hits $100m, they get scared - they'll take the existing score of a successful movie and expect composers to copy it, like wallpaper. The biggest challenge for any composer in Hollywood is to be as creative as possible within those boundaries.

The principles that should guide American foreign policy are simple: the world is safer when America leads, only strength ensures peace and freedom, and America must stand with its allies and challenge its adversaries.

City farming is not only possible, it is the very definition of the kind of meaningful, sustainable innovation we will need to meet the grand challenges of the 21st century: climate change; population growth; ageing population; urbanization; rising demand for energy, food and water; poverty; and access to healthcare.

It's challenging, but you have to at least try to eat right and exercise.

A lot of fitness has that very masculine energy and drive, and that never worked for me. I want to be challenged. I don't want to be told that I'm terrible and that I suck and that I'm not good enough - that's not motivating.

Some people have that school of thought where fitness isn't enjoyable, but we're making it enjoyable, I think, by making it more fun, challenging, and engaging rather than this boring thing that you have to do. It's about using technology and data to change this experience.

I just remember having the President's Fitness Challenge when I was in elementary school and middle school. You had to do different activities, and at the end of it, I think you got a little pin or a badge. I was like, 'How do we incorporate Captain America into high school?' You would have the 'Captain America Fitness Challenge.'

I personally love to run outdoor fitness trails. I love the meditative value I get when out alone, challenging myself to run faster and higher.

I attend to my fitness. I go the gym every day and try to maintain my physical fitness; without that, it is tough to take challenges on the chess board.

When 'Men's Health' reached out and said, 'Will you be on the 'Today Show' and do a fitness challenge?' I said, 'OK. I'm not showing them anything they don't already know.' But I'm going to take what some would argue is a negative or not substantive and turn it into a substantive thing to hopefully do some good for people.

We created Addepar because we saw a place where a multi-billion dollar global platform clearly should exist - but did not yet - to fix many of the challenges that exist in the finance industry.