Interesting topic tech.
You are lucky to have a lecturer like that, some only teach to get the pay and their real passion maybe their pet research project or the thought of kudos on promotion to a professorship. I bet he'll get a hell of a lot more respect than a guru who isn't as passionate. Looks like you're somewhat passionate about what you're studying too or you wouldn't be able to fit it all in!
Just to try and flesh out the issues: can we think of passion as zeal? or as that unshakeable faith in one's goal and it's importance?
Obviously the focus then is not on one's self or ego but on what one is trying to achieve. Where that achievement is purely to promote one's sense of self we may be able to say it is not as worthy a cause for it relates to ego alone; but in the examples you have shown it is clearly a vision or an idea which one strives for with inspirational and sometimes 'superhuman' effort.
There's also a difference imo between passion and addiction, but I bet that's a fine line at times. I'd guess that psychologists, sociologists and philosophers would have studied this specifically. I bet each would have a different take on it but the commone elements would be very useful. I might do some research on it. I think 'obsession' is another term which may be useful in this regard, provided we don't get trapped in semantics. We may all be describing the same thing using different names- the troublesome alternate views of the cathedral.
Nizar, that's an inspiring story but like so many business stories, how many fail that we never hear of? Might even be people with more passion than Schultz? But I'd say that it is one of those elements that would give you an edge over the competition, even if people fail in one venture the passion can drive them to success in the next.