I would consider the following things:

Passion
Flexibility
Hard working
Ability to work with / in a team
Intelligence / aptitude

In that particular order. From my experience, I have seen people good in most parameters, but lacking on flexibility and keen on working on 'a' particular technology or domain and unwilling to take up or perform less on any other area.

A person may be intelligent, but if he / she is not willing to put the time, heart and soul to get the results, it is not going to work.

My eye sight must be getting bad... I misread this as:

Joke Tries to Combine the Best of Lisp and Ruby