When asked why this was...
When asked why this was, he replied, "Know ye not before whom I stand in prayer, and with whom I hold discourse?" Even on the gruesome day of Ashura when Yazid's forces had massacred his father, his kith and kin and his comrades and had set fire to the camp, this Holy Imam was engrossed in his supplications to the Lord.
When the brutal forces of Yazid's army had taken the ladies and children as captives, carrying them seated on the bare back of the camels, tied in ropes; this Holy Imam, though sick, was put in heavy chains with iron rings round his neck and his ankles, and was made to walk barefooted on the thorny plains from Karbala' to Kufah and to Damascus; and even then this godly soul never was unmindful of his prayers to the Lord and was always thankful and supplicated to Him.
His charity was unassuming and hidden. After his passing away, the people said that hidden charity ended with the departure of this Holy Imam. Like his grandfather Ali ibn Abi Talib, Ali Zaynu’l-’Abidin used to carry on his own back at night bags of flour and bread for the poor and needy families in Medina and he so maintained hundred of poor families in the city. The Holy Imam was not only hospitable even to his enemies but also used to continually exhort them to the right path.
Imam Zaynu'l-`Abidin along with the Ahlu'l-bayt passed through dreadful and very dangerous times, for the aggressions and atrocities of the tyrant rulers of the age had reached a climax. There was plunder, pillage, and murder everywhere. The teachings of Islam were observed more in their breach. The heartless tyrant al-Hajjaj ibn Yusuf ath-Thagafi was threatening everyone who professed allegiance or devotion to the Ahlu'l-bayt; and those caught were mercilessly put to death.
The movement of the Holy Imam was strictly restricted and his meeting with any person was totally banned. Spies were employed to trace out the adherents of the Ahlu'1-bayt. Practically every house was searched and every family scrutinized. Imam Zaynu’l-’Abidin was not given the time to offer his prayers peacefully, nor could he deliver any sermons. This God's Vicegerent on earth therefore, adopted a third course which proved to be very beneficial to his followers.
This was in compiling supplication prayers for the daily use of man in his endeavour to approach the Almighty Lord.