In spite of the very imperfect style in which he wrote, and the usually clumsy and often careless construction of his sentences, his works contain now and then noble thoughts expressed with simplicity and force. "Natura est instrumentum Divinae operationis," might be taken as the motto for his whole system of natural science. In speaking of the value of words, he says,--"Sed considerare debemus quod verba habent maximam potestatem, et omnia miracula facta a principio mundi fere facta sunt per verba. Et opus animae rationalis praecipuum est verbum, et in quo maxime delectatur." In the "Opus Tertium," at the point where he begins to give an abstract of his "Opus Majus," he uses words which remind one of the famous "Franciscus de Verulamio sic cogitavit." He says,--"Cogitavi quod intellectus humanus habet magnam debilitationem ex se.... Et ideo volui excludere errorum corde hominis impossible est ipsum videre veritatem." This is strikingly similar to Lord Bacon's "errores qui invaluerunt, quique in aeternum invalituri sunt, alii post alios, si mens sibi permittatur." Such citations of passages remarkable for thought or for expression might be indefinitely extended, but we have space for only one more, in which the Friar attacks the vices of the Roman court with an energy that brings to mind the invectives of the greatest of his contemporaries. "Curia Romana, quae solebat et debet regi sapientia Dei, nunc depravatur.... Laceratur enim illa sedes sacra fraudibus et dolis injustorum. Pent justitia; pax omnis violatur; infinita scandala suscitantur. Mores enim sequuntur ibidem perversissimi; regnat superbia, ardet avaritia, invidia corrodit singulos, luxuria diffamat totam illam curiam, gula in omnibus dominatur." It was not the charge of magic alone that brought Roger Bacon's works into discredit with the Church, and caused a nail to be driven through their covers to keep the dangerous pages closed tightly within.