بم أدركت العلم ؟ قال : أدركت العلم بلسان سؤول ،وقلب عقول ، وبدن غير ملول
Ibn Abbas رضي الله عنهما was asked:
How did you gain your knowledge?
He said: I gained it with an inquisitive tongue (i.e. a tongue that asks questions) , an understanding heart, and a body that doesn’t get tired.
Reported by al-Imam Ahmad in his book the virtues of the Sahaabahs (970/2).