Time is the most valuable thing that we have, because it is the most irrevocable.

Dietrich Bonhoeffer (1906–1945) was a German Lutheran theologian, anti-Nazi dissident, and founding member of the Confessing Church. His writings on Christianity’s role in the secular world are widely known and influential. He was also known for his staunch resistance to the Nazi dictatorship, for which he spent time in a concentration camp and was eventually hanged.