The statement "Non cooperation became an epoch in the life of India and of Gandhi ji" is justified because non cooperation was a significant turning point in the history of India and played a crucial role in shaping the ideology and methods of Mahatma Gandhi.

1. Mass Mobilization: Non cooperation marked the first mass mobilization movement in India against British rule. It brought together people from various sections of society, including farmers, workers, students, and women, to unite and fight for independence. This widespread participation contributed to the strength and impact of the movement.

2. Use of Nonviolent Resistance: Gandhi ji firmly believed in the power of nonviolent resistance as a means to achieve political and social change. The non cooperation movement under his leadership emphasized nonviolent protests, boycotts, and civil disobedience. This approach not only showcased the moral strength of the Indian people but also exposed the oppressive nature of British rule to the international community.

3. Empowerment of Indians: Through non cooperation, Gandhi ji aimed to instill a sense of self-reliance and self-respect among Indians. By boycotting British goods, institutions, and services, Indians were encouraged to rely on their own resources and promote indigenous industries. This empowered Indians economically and politically, fostering a sense of pride and self-determination.

4. Unity and Nationalism: Non cooperation played a crucial role in fostering a sense of unity and nationalism among Indians. It brought people together across regional, religious, and caste divides, creating a collective consciousness of being part of a united Indian nation. This unity was essential for the success of the independence movement.

5. Impact on British Rule: The non cooperation movement had a profound impact on British rule in India. It exposed the weaknesses of the colonial administration and undermined their legitimacy. The withdrawal of Indian support from British institutions, such as the civil service and educational institutions, disrupted the functioning of the colonial administration, forcing the British to take Indian demands more seriously.

Overall, non cooperation became an epoch in the life of India and Gandhi ji because it marked a significant shift in the Indian independence movement. It mobilized the masses, promoted nonviolent resistance, empowered Indians, fostered unity and nationalism, and had a profound impact on British rule.