What are the motifs in Gandhi by Louis Fischer?

India's Caste System is a motif in this book.Gandhi began a "fast to death" for the cause of the "untouchables" when he was jailed by the new British regime in late 1931. As a younger man, Gandhi favored the caste system, thinking it was necessary. But as the years went by, Gandhi began to see the unfair treatment of this segment of the community as hurtful not only to these people but to Hindu society as well. In these later years, Gandhi favored intermarriage and inter-dining among castes and would not give a speech unless at least one untouchable was present. Always teaching by example, Gandhi invited untouchable families to live with him and even adopted an untouchable girl.