Kalyug is the fourth and final era in the spiritual evolution of man. This is also referred to as the 'Iron Age' of Kalyug. The word 'Yug' stands for 'Era' or 'Time Cycle'. This Yug is the most difficult for the human race and many atrocities and unfairness will become commonplace in society. SGGS Page 902: Read Text in Red Guru Ji tell us that these Yugs have no bearing on the stars, moon or the sun thus: When it becomes common for tyrants to be accepted and approved, then Kalyug is here thus: and also: SGGS Page 1288: Read Text in Red SGGS Page 145: Read Text in Red