>> I don't care who said it (My apologies, I'm always a bit critical of throwing in famous names in a discussion, the arguments should count for themselves.). Internal considerations is really all there is.
Agreed. I'm not citing authority, I'm giving credit where credit is due.
>> I wouldn't say there is any inherent good or bad in acting on strength/confidence or fear/envy. And ethics that arise from those feelings are also neither good nor bad.
Well, if we're going to hash out the basis of morality we're going to need a few more pixels. I'm not sure I agree with Nietzsche on this. I am certain that when people are scared, resentful, or envious, they can do a lot of damage. I'm also certain, based on 53 years of living, that people who are happy and confident tend to spread a lot more joy around than those who are resentful. Misery not only loves company, it creates and reinforces norms that spread misery.
>> Basically collective morality comes forth from selfish morality.
I'm not sure where you mean by this, but it's worth knowing that Hilter's National Socialist German Worker's Party stamped the slogan "The collective good over the individual good" on their coins. Want people to obey you, work for you, and die for you? Establish a morality that doing what you want instead of what the nation's leaders want (who naturally claim to represent the collective good) is bad. Or as our current Vice-President says, "unpatriotic".