He said:

“The fourth category is the attainment of further knowledge through reason, learning, inference, and sincere deeds. There is evidence for this, although its foundation is Allah’s sheer grace.

Allah Most High says:

‘As for those who believe, it has increased them in faith, and they rejoice.’

The wording ‘knowledge’ has also been transmitted.

‘And We increased them in guidance.’

‘And with Us is more.’

‘If you are grateful, I will surely give you more.’

Thus, He has promised increases and spoken of them. Whenever they sincerely act upon what they know, what was hidden from them at the first stage is unveiled to them at the second.

It is related in a hadith:

‘Whoever acts upon what he knows, Allah grants him knowledge of what he did not know.’

ʿUmar ibn ʿAbd al-ʿAzīz used to say: ‘Our ignorance of what we know lies in our failure to act upon what we know. If we understood what we know, Allah would unlock for our hearts what even our aspirations cannot reach.’

The Prophet, may Allah bless him and grant him peace, said:

‘Whoever desires honour without a clan, wealth without possessions, and knowledge without study, let him leave the humiliation of disobeying Allah for the honour of obeying Allah, and he will find all of that.’

It has also been related:

‘When a servant renounces worldly attachments, Allah, glorified be He, assigns to his heart an angel