In Radical Then, Radical Now, Rabbi Lord Jonathan Sacks addressed how, in the face of catastrophe and adversity over thousands of years, Judaism has remained and flourished. Tracing the revolutionary series of philosophical and theological ideas that Judaism created — from covenant to Shabbat to formal education — and showing how they remain compellingly relevant in contemporary times, Sacks portrays Jewish identity as an honor and a duty. Sacks originally wrote the book as a wedding gift to his son and daughter-in-law.