Bhagavad Gita

ಯದಾ ತೇ ಮೋಹಕಲಿಲಂ ಬುದ್ಧಿರ್ವ್ಯತಿತರಿಷ್ಯತಿ ।
ತದಾ ಗಂತಾನಿ ನಿರ್ವೇದಂ ಶ್ರೋತವ್ಯಸ್ಯ ಶ್ರುತಸ್ಯ ಚ ॥೫೨॥
yadā te mohakalilaṃ buddhirvyatitariṣyati |
tadā gaṃtāni nirvedaṃ śrotavyasya śrutasya ca ||52||

Gist of the sloka:
The instant you clean your mind with the dirt of ignorance, you will realize the benefit of what was earlier instructed and what will be instructed next.
Once the mind has reached a state of peace which does not vacillate between two states, then the knowledge becomes clear. Not swayed by the duality of the various situations, one will truly and fully realize the benefits of the knowledge, being instructed.
In practical scenario, we read and listen to various topics about God; but still various confusions happen. By persisting in the actions of reading, listening and discussing about the various aspects of the Lord and reading the sacred books, the mind gradually becomes empty of the various negative inhibiting thoughts. It also gradually fills up with the right knowledge and leads to a state of seeing both win/loss equally and is emptied of attachment and anger. At that state of mind, the teachings previously given and to be given becomes easily understandable. We can only then realize the benefits of the Lord’s teaching.