Expect the best,
plan for the worst and
prepare to be surprised
Denis Waitley (American motivational Speaker and Author of self-help books. b.1933)
Think about it!
p.s. Having thought about this quote a bit further, I’m not sure I totally agree with the first proposition. This would work for people who cannot deal with failures or shy away from challenges. Not sure what I would change the first statement to. Perhaps something along the lines of “expect the obvious”, as this suggests accepting that the law of averages does apply, so on average you’ll be correct. The rest follows quite nicely from there.