In Meditations on First Philosophy Descartes attempts to explain the cause of errors in human beings. Descartes says that error occurs "since the will extends further than the intellect" (Descartes p.39). That's because our intellect is something that is finite; it is limited to the perception of only certain things. Whereas our will, ability to choose is not limited; it is has an infinite capacity. Therefore we sometimes attempt to will things which we do not have a complete understanding of. Descartes' argument, as I will briefly describe, is quite sound, if you agree to all his conditions (being that the intellect is limited and the will infinite). I am not, as of yet, sure if I necessarily agree to the later of his two conditions. I will strive to evaluate different discernments of what will is, and if it is truly free. Then apply it to his argument. But first let me explain Descartes' argument on the causation of errors.
Descartes' discussion begins in saying that "errors depend on the simultaneous concurrence of two causes: the faculty of knowing that is in me and the faculty of choosing" (Descartes p.38). I will first tackle the faculty of knowing, or intellect. Descartes says that it merely perceives and understands ideas, which can later have judgment passed on them (see Descartes p.38). The intellect is limited and finite because it can occur in different degrees. While some people have a simple understanding of a language others have a mastery of its grammar and syntax. But no one can have a mastery of all the mysteries of the universe.
Then there is the faculty of choosing, as Descartes calls it, or rather the will. Descartes says that he "experience[s] that it is limit ...