Bhagavad Gita 18.16
तत्रैवं सति कर्तारमात्मानं केवलं तु यः । पश्यत्यकृतबुद्धित्वान्न स पश्यति दुर्मतिः ॥
tatraivaṃ sati kartāram ātmānaṃ kevalaṃ tu yaḥ / paśyaty akṛta-buddhitvān na sa paśyati durmatiḥ
Translation
This being so, he who sees the self alone as the doer, because his understanding is unripe, does not see, the man of poor judgement.
Reflection
Where does your self-image as the lone doer keep you from seeing what actually carried the result?
Read this verse in its chapter: Chapter Eighteen
The verdict on the ahamkara position. After the five-cause analysis, if a person still insists that he alone is the doer, the diagnosis is precise, akrita-buddhitva, an undeveloped mind. Krishna does not call it sin. He calls it not yet thinking clearly. Such a one na pashyati, does not see. He looks at the act and registers only one contributor, the I that thinks itself singular. The other four contributors stay invisible. This unripeness is the substrate from which most claim-of-credit and most pile-on-of-blame proceed. The mature mind sees the field of causes and steps out of the courtroom drama where the lone I plays both prosecutor and defendant.