The days are long, but the years are short.

One of the best ways to make yourself happy in the present is to recall happy times from the past. Photos are a great memory-prompt, and because we tend to take photos of happy occasions, they weight our memories to the good.

Being taken for granted is an unpleasant but sincere form of praise. Ironically, the more reliable you are, and the less you complain, the more likely you are to be taken for granted.

Don't let the perfect be the enemy of the good. Lower the bar. Actually spending ten minutes clearing off one shelf is better than fantasizing about spending a weekend cleaning out the basement.

Negative emotions like loneliness, envy, and guilt have an important role to play in a happy life; they're big, flashing signs that something needs to change.

Turn off your email; turn off your phone; disconnect from the Internet; figure out a way to set limits so you can concentrate when you need to, and disengage when you need to. Technology is a good servant but a bad master.

Nature is impersonal, awe-inspiring, elegant, eternal. It's geometrically perfect. It's tiny and gigantic. You can travel far to be in a beautiful natural setting, or you can observe it in your backyard - or, in my case, in the trees lining New York City sidewalks, or in the clouds above skyscrapers.

A 'treat' is different from a 'reward,' which must be justified or earned. A treat is a small pleasure or indulgence that we give to ourselves just because we want it. Treats give us greater vitality, which boosts self-control, which helps us maintain our healthy habits.

We need to have intimate, enduring bonds; we need to be able to confide; we need to feel that we belong; we need to be able to get support, and just as important for happiness, to give support. We need many kinds of relationships; for one thing, we need friends.