Punch was ultimately responsible for the now classic formulation of Ockham's Razor, in the shape of the Latin phrase entia non sunt multiplicanda praeter necessitatem, "entities are not to be multiplied unnecessarily.
[3] Punch did not attribute this wording to William of Ockham, but instead referred to the principle as a "common axiom" (axioma vulgare) used by the Scholastics.
In a letter (2 July 1644) to the agent of the Catholics, Hugo de Burgo, he says: In 1643 he published in Rome his Cursus philosophiæ.
In 1661, he published at Paris his great work, "Commentarii theologici in quatuor libros sententiarum", called by Hurter opus rarissimum.
Wadding says that he was endowed with a powerful and subtle intellect, a great facility of communicating knowledge, a graceful style, and that though immersed in the severer studies of philosophy and theology he was an ardent student of the Classics.