Be wary of friends—they will betray you more quickly, for they are easily aroused to envy. They also become spoiled and tyrannical. But hire a former enemy and he will be more loyal than a friend, because he has more to prove. In fact, you have more to fear from friends than from enemies. If you have no enemies, find a way to make them.

When it comes to fertility, there are so may things that have to go right. In any one individual, there might be one major problem and two minor ones or no major ones and seven minor ones. Throw in another person's physiology, and it's complicated. I try to give people the knowledge that they can make as many changes as they want.

Your work is the single greatest means at your disposal for expressing your social intelligence.

Win through your actions, never through argument.

I like lecturing and going around the world and giving talks and I like doing consulting and helping people.

A lot of, a big problems that people have nowadays is that they can't stand moments of no stimulation in their life so they're constantly lurking, looking for entertainment, video games.

You are facing death and danger and competition, but at any moment, you can decide to have a fearless mindset.