Hmm...Neitzche? I remember doing a paper on him in my seinor year of high school. Fascinating ideas, if a bit extreme. Look for a book (or a page about it) called "Thus Spoke Zarathustra".
As for stuff from psychologists, I don't think they'll provide you with what you're looking for. Look up B.F. Skinner if you want a good, long long long long long and very well developed arguement on how human beings develop their personalities and habits.
And a really good quote for you:
Reason is the slave of passion. - Aristotle
Some quotes for moral psychologists:
Morality differs in every society, and is a convenient term for socially approved habits. - Ruth Benedict
Take any action allow'd to be vicious: Wilful murder, for instance. Examine it in all lights, and see if you can find that matter or face, or real existence, which you call vice...You can never find it, till you turn your reflection into your own breast, and find a sentiment of disapprobation, which arises in you, toward this action. Here is a matter of fact; but 'tis the object of feeling, not reason. - David Hume
The Good consists in always doing what God wills at any particular moment. - Emil Brunner
I respect deities. I do not rely on them. - Musashi Miyamoto
The achievement of his own happiness is man's highest moral purpose. - Ayn Rand
We have to ask now, "If the end does not justify the means, what does?" The answer is, obviously, "Nothing!" - Joseph Fletcher
You may not do evil that good may come. - St. Paul
The passions that incline men to peace, are fear of death; desire of such things as are necessary to commodious living; and a hope by their industry to obtain them. And reason suggesteth convenient articles of peace, upon which men may be drawn the agreement. These articles, are they, which otherwise are called the Laws of Nature. - Thomas Hobbes
The concepts of obligation, and duty--moral obligation and moral duty, that is to say--and of what is morally right and wrong, and of the moral sense of "ought", ought to be jettisoned....It would be a great improvement if, instead of "morally wrong," one always named a genus such as "untruthful", "unchaste," "unjust." - G.E.M. Anscombe
And a few other quotes:
I think, therefore I am. - Rene Descartes
All men are created equal, nothing, and have certain unalienable rights. Among them: life, liberty, and the pursuit of property. - John Locke