Erasmus granted to the adage “Amicorum communia omnia” the privilege to take the first entry among his six-volume Adages(ed. CWE, vol. 31-36). The idea which may be hinted at in this editing order refers to Platonic ideal of community, a reference which becomes more obvious when are remarked the common place in topic between the first and the second adage “Amicitia aequalitas. Amicus alter ipse”, and the common interest which can be found in other humanists of his days such as Guillaume Bude(1468-1540) and Thomas More(1478-1535). This paper aims to make sense of the French author’s philosophy of law by starting from the reading of his dedicatory letter to More’s Utopia. With as many disagreements as approvals, Budé articulates in the brief letter his idea of justice in comparison with that of More. In this respect, the phrase “Pythagorica communio & charitas” offers us a key to understanding these approvals and disagreements in the concept of justice between the two great thinkers. As E. L. Surtz rightly says, charity-based communism is exactly “an underlying consistency in the attitude” in most of the humanists of those days: More, Budé, Lister, and Erasmus. By the way, it is observed that an accent was put on a different precept of law in Budé’s theory of justice than in More’s utopian idealism. That is, while the latter advances an egalitarian point of view as fitting the communism, the former attempts to keep balances between commutative and distributive justices. A richer account of this concept is acquired when we attentively read Budé’s comments on D. 1, 1 in his Annotationes in Pandectas.