Others experienced bitter disappointment when they saw wayward ones violate Jehovah's standards and work against his will. Some.......felt the frustrating effacts of complacency and self indulgence on the part of professed worshipers of Jehovah around them. ................You may at times be disheartened by a lack of zeal evident in some who have served God.
Its actually a skilfully written piece of propaganda. Notice that throughtout the chapters summarized its always somone else who feels tired or discouraged and by contrast the reader is subtly made to conceal these feelings and be indignant with those who have allowed their feelings to effect them and become "indulgent", "complacent", lacking "zeal".