I think Aristotle believes that the “purpose” of a human is to be excellent “reasoners”, since he defines reason as being the one function that is unique to human beings:
**“the proper * function of a human, then, consists in an activity of the soul in conformity with a rational principle * or, at least, not without it” ****
(1098a)
"If we take the proper function of a human to be a certain kind of life, and if this kind of life is an activity of soul and consists in actions performed in conjunction with the rational element,…, and if a function is well performed when it is performed in accordance with the excellence appropriate to it; we reach the conclusion that the good of a human is an activity of soul in conformity with excellence or virtue [of the rational element and of our ability to act on our decisions]"
(1098a).
source -
classweb.gmu.edu/rcherubi/ancient/ne411.htm
Aristotle also mentions this:
"For this reason also a boy is not happy; for he is not yet capable of such acts, owing to his age; and boys who are called happy are being congratulated by reason of the hopes we have for them."
source -
classics.mit.edu/Aristotle/nicomachaen.1.i.html
Now, from my understanding, these quotes appear to somewhat contradict the following scripture passage:
"And he said: ‘I tell you the truth, unless you change and become like little children, you will never enter the kingdom of heaven.’"
Matthew 18:3
Would you not agree that Aristotle, at the very least, appears to be over-emphasizing the necessity of reason in our nature?
Yes I agree that Aristotle defines reason/contemplation as the highest aim of man but only insofar as contemplation gets us to the true highest aim which is “happiness” or “blessed life”. If contemplation did not constitute happiness, then Aristotle would not suggest it as the chief goal. As such, Aristotle establishes numerous preconditions for happiness/contemplation like good health, good fortune, etc. so that one’s contemplation is not interrupted.
But this does not have anything to do with faith which Aristotle, IMO, necessarily defends in all of his admonitions scattered throughout his treatises on believing in what “the majority thinks”, or in what “happens most of the time”, or in what “an expert says”. His whole book “Rhetoric” I think is a long defense of the use and attainment of faith and probabilities, for faith is just a certainty that is backed by uncertain evidence.
This ties into, rather than contradicts that biblical passage. For by childlike faith, we choose to submit to certain reasons and teachers, trusting them without full evidence to shepherd us to truth and real certainty.
Considering Aristotle’s definition of happiness in this life, I do not think that he overemphasizes reason. If you want such overemphasis then seek the stoics or the platonists but Aristotle is almost downright cynical in compared with them, praising pleasure repeatedly throughout the “Nicomachean Ethics” and making bodily pleasures and health a necessary part of happiness.
One cannot deny that contemplation is the act of human happiness, for in the future world, our happiness will be the contemplation of God as will our love be the analysis of God, for to know him is to love him (The Summa Pt. 1 of Part 2).