The loneliness of the Christian results from his walk with God in an ungodly world, a walk that must often take him away from the fellowship of good Christians as well as from that of the unregenerate world.
His God-given instincts cry out for companionship with others of his kind, others who can understand his longings, his aspirations, his absorptions in the love of Christ; and because with his circle of friends there are few who share his inner experiences, he’s forced to walk alone.
The unsatisfied longings of the prophets for human understanding caused them to cry out in their complaint, and even our Lord himself suffered in the same way.
The man (or woman) who has passed on into the divine Presence in actual inner experience will not find many who understand him. He finds few who care to talk about that which is the supreme object of his interest, so he is often silent and preoccupied in the midst of noisy religious shoptalk. For this he earns the reputation of being dull and over-serious, so he is avoided, and the gulf between him and society widens.
He searches for the friends upon whose garments he can detect the smell of myrrh and aloes and cassia out of the ivory palaces, and finding few or none, he, like Mary of old, keeps these things in his heart.
It is this very loneliness that throws him back upon God. His inability to find human companionship drives him to seek in God what he can find nowhere else.