我们以为我们有这么多问题。我们怎么知道我们是幸福的？

Give me a dozen healthy infants, well-formed, and my own specified world to bring them up in and I'll guarantee to take any one at random and train him to become any type of specialist I might select—doctor, lawyer, artist, merchant-chief and, yes, even beggar-man and thief, regardless of his talents, penchants, tendencies, abilities, vocations, and race of his ancestors.

When we speak of 'meaning' a word， we are in the first instance speaking of a certain kind of act.

I’m a great believer in solving hard problems by using a checklist. You need to get all the likely and unlikely answers before you; otherwise it’s easy to miss something important.

The heart remembers what the mind tries to forget.

"The only way to do great work is to love what you do."