Critics maintain that Kim Jong-il's personality cult was inherited from his father. Kim Jong-il was often the center of attention throughout ordinary life. His birthday is one of the most important public holidays in the country. On his 60th birthday (based on his official date of birth), mass celebrations occurred throughout the country. Kim Jong-il's personality cult, although significant, was not as extensive as his father's. One point of view is that Kim Jong-il's cult of personality was solely out of respect for Kim Il-sung or out of fear of punishment for failure to pay homage, while North Korean government sources consider it genuine hero worship.