Why is Knowledge Learned?

It is reported that Sufyān Al-Thawrī – Allāh have mercy on him – said:

Knowledge is only learned to [apply it and] put into practice the Taqwā of Allāh the mighty and sublime.

Abū Bakr Al-Daynūrī, Al-Mujālasah wa Jawāhir Al-ʿIlm article 943.