Original sentence: A historical and philosophical study of Ahimsa was instrumental in the shaping of Albert Schweitzer's principle of "reverence for life".Schweitzer praised Indian philosophical and religious traditions for ethics of Ahimsa as, "the laying down of the commandment not to kill and not to damage is one of the greatest events in the spiritual history of mankind", but added that "not-killing and not-harming" is not always practically possible, nor ethical in extreme chronic cases
Edited sentence: A thorough historical and philosophical study of Ahimsa was instrumental in the shaping of Albert Schweitzer's principle of "reverence for life".Schweitzer criticized Indian philosophical and religious traditions for having conceived Ahimsa as the negative principle of avoiding violence instead of emphasizing the importance of positive action (helping injured beings)