Lesson no. 17: Happiness is caring about the happiness of those you love.

Nobody wants to live with a person who'll never be happy.

You must be careful when you ask people whether they’re happy it’s a question that can upset them a great deal.

Knowing and feeling are two different things, and feeling is what counts.

We fall in love or stay in love with people who are unsuitable or who no longer love us and, conversely, we feel no love towards people who would be very suitable. Love is involuntary, that's the problem. Our personal histories prepare us to be attracted to people who unconsciously evoke emotions from our childhood or adolescence.

Making comparisons can spoil your happiness.

Happiness often comes when least expected.

Be vary wary of people who declare that they're going to create heaven on earth, they almost invariably create hell.

Many people think that happiness comes from having more power or more money.

He who spends too long regretting his ruined crop will be neglect to plant next year's harvest.

People fall in love more easily when they are already troubled by another emotion because we know that any intense emotional state greatly increases the risk of falling in love.