[1] In 1310, de la Mare was classed with Bonaventura, John Peckham, and others among the "solemn masters" of the order.
[3] De la Mare wrote scholarly notes relating to biblical texts, including textual notes (his Correctio textus bibliae), a linguistic references for the Hebrew used in original version of biblical scripture (the De hebraeis et graecis vocabilis glossarum bibliae).
[2] In the period 1277–9, de la Mare composed a work on Thomas Aquinas, the Correctorium, or Reprehensorium.
De la Mare argues that, as the "principium individuationis" is, according to the Thomists, matter, and not form, individuality, according to them, ceases to exist as soon as the soul leaves the body; in other words, the Dominican school supported the Averroistic heresy of the universal soul.
De la Mare also wrote in favour of a strict observance of the rule of St. Francis.