I alone did it

tatraivaṃ sati kartāramātmānaṃ kevalaṃ tu yaḥpaśyatyakṛtabuddhitvānna sa paśyati durmatiḥ

So, whoever sees the Self as the only doer, through an untrained understanding, does not truly see. Their judgement is poor.

What it means

Krishna draws the conclusion. Anyone who thinks I alone did this, and sees themselves as the only doer, isn't seeing clearly. Their buddhi, understanding, isn't yet trained. Taking responsibility is good. Taking all the credit, or all the blame, is a distortion.

The story

Arjuna feared being the sole cause of his family's deaths. Krishna shows that this belief, though it feels like conscience, is actually a mistake in seeing.

In your life

Think of a parent blaming themselves entirely for a child's struggles, ignoring every other factor. Be fair to yourself today. Own your part, and only your part.