Reb Zusha used to say:  “When I die and come before the heavenly court, if they ask me, ‘Zusha, why were you not Abraham?’  I’ll say that I didn’t have Abraham’s intellectual abilities.  If they say, ‘Why were you not Moses?’  I’ll say I didn’t have Moses’ leadership abilities.  For every such question, I’ll have an answer.  But if they say, ‘Zusha, why were you not Zusha?’ for that, I’ll have no answer.”