不患無位，患所以立。

Worrying
not one’s position, but one’s capability

Do not be concerned when without official position, be concerned with where a stand is established.

不患無位，患所以立。

Don't be concerned about not getting a good position*,
be concerned about your competency and good behavior after you got the position.

*In the original context, "position" means a government officail position in running the country, with responsibilites that affect the lives of the people. That is the reason behind the emphasis on the ability and character of the person occupying the position.