It is reported that Mālik ibn Dīnār (rahimahullāh) said,
If a man seeks knowledge to act upon it, his knowledge will make him happy. And if he seeks knowledge, for other than acting upon it, his knowledge increases him in haughtiness.
عن أبي العالية قال : كان أبي صاحب عبادة ، فلما احتاج الناس إليه ، ترك العبادة وجلس للقوم
On Authority of Abī Ā'liyah
Ubayy ibn K'ab used to be a person of worship,
Imam Ahmad ibn Hanbal (rahimahullah):
I did not write a single hadeeth except verily I acted on it, to the extent that it came to me that the Prophet (sallallaahu alaihi wa sallam) was cupped and gave Abaa Tayba a deenar, so I was cupped and gave the
Imam Ash-Shaafi’ee (rahimahullah) said:
“Knowledge is not that which has been memorised, it is that which benefits.”
Tadhkiratus Saami’ wal Mutakallim page 37
Sufyan ath Thawree: A single hadeeth from the Messenger of Allah did not reach me, except that I acted on it, even if it was only the once. Siyaar A’laam An-Nubalaa vol 7 page 242
The learned men, or people are those who act after knowing.