Yes. The principle of knowledge is in the senses because on the part of the phantasms, intellectual knowledge is caused by the senses.
Principium nostrae cognitionis est a sensu quia ex parte phantasmatum intellectualis operatio a sensu causatur.
But since the phantasms cannot of themselves affect the passive intellect, and require to be made actually intelligible by the active intellect, it cannot be said that sensible knowledge is the total and perfect cause of intellectual knowledge, but rather that it is in a way the material cause.
Sed quia phantasmata non sufficiunt immutare intellectum possibilem, sed oportet quod fiant intelligibilia actu per intellectum agentem, non potest dici quod sensibilis cognitio sit totalis et perfecta causa intellectualis cognitionis, sed magis quodammodo est materia causae.
We must not expect the entire truth from the senses. For the light of the active intellect is needed, through which we achieve the unchangeable truth of changeable things, and discern things themselves from their likeness.
Veritas non sit totaliter a sensibus expectanda. Requiritur enim lumen intellectus agentis, per quod immutabiliter veritatem in rebus mutabilibus cognoscamus, et discernamus ipsas res a similitudinibus rerum.
Aristotle, with Plato, he agreed that intellect and sense are different. But he held that the sense has not its proper operation without the cooperation of the body; so that to feel is not an act of the soul alone, but of the "composite." And he held the same in regard to all the operations of the sensitive part.
Aristoteles autem media via processit. Posuit enim cum Platone intellectum differre a sensu. Sed sensum posuit propriam operationem non habere sine communicatione corporis; ita quod sentire non sit actus animae tantum, sed coniuncti. Et similiter posuit de omnibus operationibus sensitivae partis.
Since, therefore, it is not unreasonable that the sensible objects which are outside the soul should produce some effect in the "composite," Aristotle agreed with Democritus in this, that the operations of the sensitive part are caused by the impression of the sensible on the sense: not by a discharge, as Democritus said, but by some kind of operation. For Democritus maintained that every action comes into being by way of a discharge of atoms, as we gather from De Gener. i, 8.
Quia igitur non est inconveniens quod sensibilia quae sunt extra animam, causent aliquid in coniunctum, in hoc Aristoteles cum Democrito concordavit, quod operationes sensitivae partis causentur per impressionem sensibilium in sensum: non per modum defluxionis, ut Democritus posuit, sed per quandam operationem. Nam et Democritus omnem actionem fieri posuit per influxionem atomorum, ut patet in I de Generat.
But Aristotle held that the intellect has an operation which is independent of the body's cooperation. Now nothing corporeal can make an impression on the incorporeal. And therefore in order to cause the intellectual operation according to Aristotle, the impression caused by the sensible does not suffice, but something more noble is required, for "the agent is more noble than the patient," as he says (De Gener. i, 5).
Intellectum vero posuit Aristoteles habere operationem absque communicatione corporis. Nihil autem corporeum imprimere potest in rem incorpoream. Et ideo ad causandam intellectualem operationem, secundum Aristotelem, non sufficit sola impressio sensibilium corporum, sed requiritur aliquid nobilius, quia "agens est honorabilius patiente", ut ipse dicit.
Not, indeed, in the sense that the intellectual operation is effected in us by the mere impression of some superior beings, as Plato held; but that the higher and more noble agent which he calls the active intellect, of which we have spoken above (Q79, A3; Q79, A4) causes the phantasms received from the senses to be actually intelligible, by a process of abstraction.
Non tamen ita quod intellectualis operatio causetur in nobis ex sola impressione aliquarum rerum superiorum, ut Plato posuit; sed illud superius et nobilius agens quod vocat intellectum agentem, de quo iam supra diximus, facit phantasmata a sensibus accepta intelligibilia in actu, per modum abstractionis cuiusdam.