Is this Quite by Kenneth Boulding True

[brewer]

"Nothing fails like success, because we don't learn anything. We only learn from failure. our successes only confirm our superstitions."
I'd like to hear your thoughts on this.

Sounds like a crock to me. Success allows humans to continue with other attempts (a few will want to sit on their laurels). Think of all the milestones a child has to master to continue. We learn plenty from success, example: Einstein. 

I have know clue about the superstition shit. Makes more sense if you use hypothesis.

[Alan V]

If you want material advantages, a success is a success.  You can learn by becoming a success and maintaining your success.  

Although we may learn more from failures, sometimes we just learn how to fail rather than how to succeed.

On the other hand, I do know successful people who confuse their expertise with knowledge of other areas.  They can become arrogant and fail to listen to people who have other kinds of expertise.

So I think the saying points out an important observation, but it's too much of an over-statement.  It comes close to rationalizing failures.

IOW, would you say the all inclusive language of the quote takes it beyond the realm of truth? Perhaps it's tangential to truth?

I see pluses and minuses everywhere.  The author of the quote was pointing out the possible downside to success, but I do think he should rephrase it for accuracy.