Solitude does not necessarily mean living apart from others; rather, it means never living apart from one's self. It is not about the absence of other people, it is about being fully present to ourselves, whether or not we are with others.
Notice that the more you become a connoisseur of gratitude, the less you are the victim of resentment, depression, and despair. Gratitude will act as an elixir that will gradually dissolve the hard shell of your ego -- your need to possess and control -- and transform you into a generous being. The sense of gratitude produces true spiritual alchemy, makes us magnanimous -- large souled.