"What is action, and what is non-action?" On this, even the wise are bewildered. So I will explain to you that action, knowing which you will be freed from what is inauspicious.
Explanation
Krishna is teaching Arjuna about action (karma) and why he should act rather than withdraw. He says that even the wise (kavayaḥ) are confused about what counts as action and what counts as non-action (akarma). He promises to clarify this, so that Arjuna can be freed from the "inauspicious", which is usually read as the bondage of rebirth and suffering.