Alexander wept when he heard from Anaxarchus that there was an infinite
number of worlds; and his friends asking him if any accident had befallen
him, he returns this answer: "Do you not think it a matter worthy
of lamentation that when there is such a vast multitude of them, we
have not yet conquered one?"
-- Plutarch (46-120 AD)
-- On the Tranquillity of the Mind
Related:
Whenever Alexander heard Philip had taken any town of importance
or won any signal victory, instead of rejoicing at it altogether,
he would tell his companions that his father would anticipate everything,
and leave him and them no opportunities of performing great and illustrious
actions....