Who said 'intelligence without ambitions is a bird without wings'?

A bird without wings exists, but it never flies anywhere. Similarly, intelligence produces great ideas, but without the driving force of ambition (a willingness to do the work to turn a concept into reality) those ideas usually never end up 'taking off' either.

This expression is an example of a metaphor: it directly compares two things (intelligence and birds) to make a point. If it had said instead, "Intelligence without ambition is like a bird without wings," it would have been a simile, an indirect comparison of the two ideas.