The abstract intelligence produces a fatigue that's the worst of all fatigues. It doesn't weigh on us like bodily fatigue, nor disconcert like the fatigue of emotional experience. It's the weight of our consciousness of the world, a shortness of breath in our soul.
Fernando PessoaI have at this moment so many fundamental thoughts, so many truly metaphysical things to say, that I suddenly get tired and decide not to write any more, not to think any more, but to allow the fever of speaking to make me sleepy, and with my eyes closed, like a cat, I play with everything I could have said.
Fernando Pessoa