Yogācārabhūmi Śāstra, Volume 34 (75)

Original text:当知此中。由观察作意。于一切修道。数数观察。已断未断。如所得道。而正修习。又于此中。云何名修自性。云何名修业。云何名修品类差别。谓由定地作意。于世出世善有为法。修习增长。无间所作。殷重所作。令心相续。会彼体性。如是名为修之自性。

Explanation: In the process of cultivating the path, because there is the attention of observation (manaskāra), throughout the entire process of cultivating the path, one repeatedly and repeatedly observes which afflictions one has already eradicated and which afflictions one has not yet eradicated, and cultivates correctly and in accordance with the Dharma the path that should be cultivated. In the process of cultivating the Four Noble Truths, what is called the intrinsic nature of cultivation? What is called the activity of cultivation? What are the categorical differences of cultivation? It means applying attention within meditative concentration (samādhi) to cultivate and grow wholesome conditioned dharmas, both worldly and supramundane, practicing them without interruption, practicing them earnestly and diligently, causing the mind to continue on without interruption, so that the mind abides continuously in wholesome dharmas, and the mind conforms to the intrinsic nature of the wholesome — this is called the intrinsic nature of cultivation.