We might think of these two kinds of loneliness as two forms of blindness. The first blindness comes from the absence of light, the second from too much light. The first loneliness we must try to outgrow with faith and hope. The second we must be willing to embrace in love.
For further reflection...
Turn to me and be gracious to me, for I am lonely and afflicted. - Psalm 25:16 (NIV)
This devotional is taken from Henri Nouwen: henrinouwen.org