He showed pronounced thirst for knowledge right as an young boy and had completed ths study of Sikh religion, Sikh history, and Sikh scriptures by ag… - Zail Singh

The year 1984 was the most painful year for my father. He was deeply hurt both by Operation Blue Star and the anti-sikh riots. His agony was that despite being the supreme commander of Indian defense forces, he was neither consulted before Operation Blue Star nor could he, in spite of his best efforts, stop the riots against innocent Sikhs.

Darabara Singh blamed him [when he was Home Minister] for encouraging Sikh religious leader, Jarnail Singh Bindranwale, in his militant activities. … Darbara Singh said that when Bindranwwale had visited Delhi with his gun totting supporters, arrangements were made to arrest him on the national highway on his way back to Punjab, but he [Zail Singh] as Union Home Minister, cancelled these orders.

I am not in the habit of making forecasts; but when I do I am usually right. I forecast that he will be the most popular President that India had so far. He is first Sikh, the first Punjabi, and the first person belonging to the backward classes to occupy Rashtrapathi Bhavan.