Imam Jalal ad-Din as-Suyuti {May Allah have mercy upon him} relates that a certain visitor came to observe Imam Abu Hanifah {May Allah have mercy upon him} and saw him all day long in the Masjid, teaching relentlessly, answering every question from both the scholars and the common people, not stopping except to pray, then standing at home in prayer when people were asleep, hardly ever eating or sleeping, and yet the most handsome and gracious of people, always alert and never tired, day after day for a long time, so that in the end the visitor said:
“I became convinced that this was not an ordinary matter, but it is that he has Friendship with Allah.”
{Tabyid as-Sahifa}