Mersenne's father wanted his son to have a career in the Church. Mersenne, however, was devoted to study, which he loved, and, showing that he was ready for responsibilities of the world, had decided to further his education in Paris.
Mersenne ng ama ang kanyang anak na nais na magkaroon ng isang karera sa Iglesia. Mersenne, gayunman, ay tapat sa pag-aaral, na kung saan siya ang pag-ibig, at, na nagpapakita na siya ay handa na para sa mga responsibilidad ng mundo, ay nagpasya sa karagdagang kanyang pang-edukasyon sa Paris.