Nobody EVER got successful from luck? Not even people born billionaires or royalty?
I don't think you're applying the negation correctly; "not every success was from luck" means "at least one success was not from luck." Similarly, if you broaden your viewpoint to before the moment of someone's birth, it seems silly to claim that it's an accident that they were born a billionaire or royalty; it's not like their ancestors put no planning into acquiring their wealth or their titles.
Only if you're using some definition of happiness that includes a term like "Philosophical fulfillment" or some such, which makes the issue tautological.
Not really; this is a nontrivial empirical claim that turns out to be correct. People with solid philosophical grounding are measurably happier (on standard psychological surveys of happiness) than people without.
I didn't read that as a negation of "success in life has to be achieved... through sheer blind luck" but rather of "real success is never accidental". Both, of course, are descriptively false (at least for values of "real" that don't bake in the conclusion), though as a normative statement I'd rate the former as much more problematic.
Another month, another rationality quotes thread. The rules are: