I suspect concepts like fate, destiny, happenstance, kismet, etc. are meaningless and, worse, misleading to non-critical thinkers but I find myself using expressions involving luck or lucky all the time! 'Luckily another bus turned up so I wasn't late.' It seems to be the same thing as fate, etc. but seems unavoidable and even useful in everyday speech. Is there any difference, or is it just a linguistic convention? No one would say 'A causal chain of events extending back to the Big Bang led to another bus showing up.'
Thanks to you all for a fascinating site.