Except one

If you find a key to every door
except one
if you win every war
except one
if you solve all your problems
except one
if you find every answer
except one
don't come to me
don't ask me why
'cos I don't know...
'cos I have found a key to every door
except one
and I have won every war
except one
and I have solved all my problems
except one
and I have found every answer
except one
so don't come to me
don't ask me why
'cos I don't know