Paul Sabatier quotes
All sorrows are sisters; a secret intelligence establishes itself between troubled hearts, however diverse their griefs. The poor people felt that their friend also suffered; they did not precisely know with what, but they forgot their own sorrows in pitying their benefactor. Suffering is the true cement of love. For men to love each other truly, they must have shed tears together.
Life of St. Francis d'Assisi (1894)