True freedom means freeing oneself from the dictates of the ego and its accompanying emotions.

Happiness is a state of inner fulfillment.

Although the optimist may be a little giddy when foreseeing the future, telling himself that it will all work out in the end when that isn't always the case, his attitude is more fruitful since, in the hope of undertaking a hundred projects, followed up by diligent action, the optimist will end up completing fifty. Conversely, in limiting himself to undertake a mere ten, the pessimist might complete five at best and often fewer, since he'll devote little energy to a task he feels to be doomed from the start.

You get [something] in your body that is the suffering or the problem, and then you [add] a second one, which is worry. In both cases, [it is] pointless.

No change occurs if we just let our habitual tendencies and automatic patterns of thought perpetuate and even reinforce themselves, thought after thought, day after day, year after year. But those tendencies and patterns can be challenged.

We cannot study everything at the same time.

[Some of the people I'd met] were wonderful people as human beings, and some people were more difficult. I could not see a correlation between their particular genius in playing chess and music and mathematics, etc. ... with human qualities. Some were really good, wonderful people, and some were difficult characters, but there was no clear correlation. But when I met some spiritual masters, [I thought that] there had to be a correlation, and it turned out to be true.