Aristoteles Ethik

1. "Our account of this science will be adequate if it achieves such clarity as the subject-matter allows; for the same degree of precision is not to be expected in all discussions, any more than in all products of handicraft." (Nicomachian Ethics Book I, Chapter 3)

Aristoteles gibt uns hier Warnung, dass die Ethik nicht präzise ist, denn sie kann nicht universal bestimmten, was passieren soll.

2. "[T]he good for man is an activity of the soul in accordance with virtue, or if there are more kinds of virtue than one, in accordance with the best and most perfect kind." Book I, Chapter 7,

Das Gute Leben steht in engem Zusammenhang mit dem tugendhaften Leben. Das Gute Leben bedeutet dabei vor allem eine Aktivität und ist kein Zustand, hierzu können allerdings auch innere Tätigkeiten wie Tagträumen gehören. Alles in allem ist Glück eine Tätigkeit, die ausgeführt werden muss. 

See Sparknotes: http://www.sparknotes.com/philosophy/ethics/quotes.html

3.
So virtue is a purposive disposition, lying in a mean that is relative to us and determined by a rational principle, by that which a prudent man would use to determine it.

This quotation from Book II, Chapter 6, gives us a clear expression of Aristotle’s Doctrine of the Mean: virtue is a mean disposition between the vicious extremes of excess and deficiency. In calling virtue a “purposive” disposition, Aristotle means that virtue is not just a disposition we sit on and do nothing about, but is rather the impetus that leads us to virtuous activity.
Aristotle gives no rules as to what counts as a mean. His reason is that the mean depends greatly on the person and the situation. Rather than lay down any rules, he recommendsphronesis, or prudence, which helps us reason our way through practical matters and determine the best course to take.
4.
Between friends there is no need for justice, but people who are just still need the quality of friendship; and indeed friendliness is considered to be justice in the fullest sense. It is not only a necessary thing but a splendid one.

Aristotle makes this assertion in Book VIII, Chapter 1. Neither friendship nor justice is listed in Aristotle’s table of virtues and vices, because both are more general than the particular virtues and vices listed there. In Book V, Aristotle explains that justice comprehends all the virtues, since acting justly consists essentially of acting in accordance with all the virtues.
Aristotle bases his conception of justice on a conception of fair exchange, and does the same for friendship. Friendships are balanced by the fact that each friend gives as much as receives. Hence, justice and friendship are closely connected.
Citizens in the Greek city-states were expected to take a very active role in the government of their city-state, so justice and civic duty would have been a concern for all. A complete life could not have been lived in solitude, so justice and friendliness between fellow citizens was essential.
5.
[C]ontemplation is both the highest form of activity (since the intellect is the highest thing in us, and the objects that it apprehends are the highest things that can be known), and also it is the most continuous, because we are more capable of continuous contemplation than we are of any practical activity.

Near the end of the Ethics, in Book X, Chapter 7, Aristotle concludes that contemplation is the highest human good. Aristotle distinguishes rationality, and the intellect in particular, as the highest human functions, since these are the functions that distinguish us from other animals. It is also through the intellect that we can think about philosophy, God, and nature, which Aristotle considers to be far more noble objects of thought than the daily matters of human society. Consequently, he reasons that a life of continuous contemplation is the best possible human life. Of course, life cannot consist solely of contemplation, since practical matters always need dealing with, but in Aristotle’s view, the more contemplation the better. Practical wisdom and the moral virtues are noble and essential to securing the good life, but the good life itself consists foremost of contemplation.