““And, like Buddha, Spinoza is often dismissed as a mere seeker of tranquillity – but what he valued most was joy, which he defined as a sense of empowerment created by the understanding mind. But, again as in the teachings of Buddha, understanding is not a passive, final state, but a process requiring ceaseless effort. In another insight prefiguring neurobiology, which defines living organisms as systems for optimizing life conditions, Spinoza suggested that our very nature is to strive. His Latin word for human nature, conatus, means ‘striving’ or ‘endeavour’: ‘The striving by which each thing attempts to persevere in its being is nothing other than the actual essence of the thing.’ And the striving has to be difficult to be valuable: ‘If salvation were readily available and could be attained without great effort, how could it be neglected by almost everyone? All that is excellent is as difficult to attain as it is rare.””