From an early stage Brouwer was interested in the philosophy of mathematics, but he was also fascinated by mysticism and other philosophical questions relating to human society.
Mula sa isang maagang yugto Brouwer ay interesado sa pilosopiya ng matematika, ngunit siya rin ay nabighani sa pamamagitan ng mistisismo at iba pang mga pilosopiko mga katanungan na may kaugnayan sa tao lipunan.