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.

Imagine a ship that is sinking and needs all the available power to run the pumps to drain out the rising waters. The first class passengers refuse to cooperate because they feel hot and want to use the air-conditioner and other electrical appliances. The second-class passengers spend all their time trying to be upgraded to first-class status. The boat sinks and the passengers all drown. That is where the present approach to climate change is leading.

We do all kinds of things to remain beautiful. Yet, we spend surprisingly little time taking care of what matters most - the way our mind functions.

By happiness I mean here a deep sense of flourishing that arises from an exceptionally healthy mind. This is not a mere pleasurable feeling, a fleeting emotion, or a mood, but an optimal state of being. Happiness is also a way of interpreting the world, since while it may be difficult to change the world, it is always possible to change the way we look at it.

Humility does not mean believing oneself to be inferior, but to be freed from self-importance. It is a state of natural simplicity which is in harmony with our true nature and allows us to taste the freshness of the present moment.

We must distinguish between spirituality in general terms, which aims to make us better people, and religion. Adopting a religion remains optional, but becoming a better human being is essential.

It is in learning music that many youthful hearts learn to love.