People are like stained - glass windows. They sparkle and shine when the sun is out but when the darkness sets in their true beauty is revealed only if there is a light from within.
Probably nothing serious or worthwhile can be accomplished without one's willingness to be alone for sustained periods of time which is not to say that one must live alone obsessively.
Look at the Afghans during the time of the Soviet invasion. They were among the poorest Muslims in the world yet they were sustained by their faith in God and God alone.
I lost my dad way too early and it was agonisingly awful. I missed him so much and I hated knowing that I could never again pick up the phone to tell him about my day.