Discourses: Book 2 19 : 6
And so now I am your teacher, and you are being taught in my school. And my purpose is this—to make of you a perfect work, secure against restraint, compulsion, and hindrance, free, prosperous, happy, looking to God in everything both small and great; and you are here with the purpose of learning and practising all this. Why, then, do you not complete the work, if it is true that you on your part have the right kind of purpose and I on my part, in addition to the purpose, have the right kind of preparation? What is it that is lacking? When I see a craftsman who has material lying ready at hand, I look for the finished product. Here also, then, is the craftsman, and here is the material; what do we yet lack? Cannot the matter be taught? It can. Is it, then, not under our control? Nay, it is the only thing in the whole world that is under our control. Wealth is not under our control, nor health, nor fame, nor, in a word, anything else except the right use of external impressions. This alone is by nature secure against restraint and hindrance. Why, then, do you not finish the work? Tell me the reason. For it lies either in me, or in you, or in the nature of the thing. The thing itself is possible and is the only thing that is under our control. Consequently, then, the fault lies either in me, or in you, or, what is nearer the truth, in us both. What then? Would you like to have us at last begin to introduce here a purpose such as I have described? Let us let bygones be bygones. Only let us begin, and, take my word for it, you shall see.