Since thought hardly can be defined as different from many other forms of reflection, any feature belonging to the thinker as thinker is relevant for its understanding.
When Socrates speaks about philosopher as a stranger to the city, he decides that all the features of thought are to be disclosed in the activity of thinking.
As long as we accept that the philosopher is yet in the city, the features pertaining to such habitation can be viewed as characteristics of the thought itself. Most of these features are forms of worry about the place philosopher could occupy in the city or in the world.
It is largely recognized that thought consists in interrogations and uncertainties concerning the city and the world. So, they seem to be forms of worry. Nonetheless, they can be in fact just whimsical hesitations of the philosopher caused by his unrecognized will to dominate the city and the world. Many philosophical debates that seem to revolve the social or political order prove to be simple games, not worries, when they have as their final goal just the victory of a belief over other beliefs.
The worry about world belongs to the thought, when it allows to the world and to the city to trouble the confidence in the existence of a province of thought or the trust into an unshakable philosophical condition.