I wonder what difference Jesus ministry would have seen had he never pursued solitude? How tenaciously did he grasp time alone or with the twelve? Isolation from the teeming crowds, the needy and the curious? How important was inner settling to his ability to work out all the Messiah stuff required? He didn't take lost souls and hungry people with him to the quiet places. He left them behind. He refreshed himself so he could better serve them upon his return and because he knew that all of life is not merely service. Reflection, evaluation, grappling with truth, and maintaining balance are necessary as well, in order for all to be accomplished.
Service meets the needs of service but it does not restore the fatigued heart. Inner being cannot be examined or heard when the outer being is busy tending a completely different soul.
There is no shame in seeking personal solitude. It is not selfish. Quite the contrary. And it is not a thing that is to be shared. It is s.o.l.i.t.u.d.e. The needy are not neglected when sincere people isolate themselves for a time of revitalization. The neglect is when the refreshment is sacrificed for the sake of the needy.
Tend to the teeming masses in the everyday. Separate from them for special solitude alone or with intimates.
Come to know the difference.