Without the solitude of heart, the intimacy of friendship, marriage and community life cannot be creative. Without the solitude of heart, our relationships with others easily become needy and greedy, sticky and clinging, dependent and sentimental, exploitative and parasitic, because without the solitude of heart we cannot experience the others as different from ourselves but only as people who can be used for the fulfilment of our own, often hidden, needs.
- from 'Reaching Out' by Henri J. M. Nouwen