BhG 3.17

Karma-Yoga is not meant for the Self-knower.
Now, the Lord Himself supposes Arjuna to ask the following question: Is the wheel, thus set in motion, to be followed by all, or by him only who has not yet attained to devotion in the path of knowledge which the Sankhyas or Self-knowers tread and which is attainable by the ignorant by means of devotion in the path of action already described? In answer to this question, or with a view to afford, of his own accord, a clear understanding of the teaching of the śastra, He proceeds to show that what is intended to be taught in the Gita-śastra is the same truth that is embodied in the following passage of the śruti:

„The brahmaṇas (the devotees of the Brahman, the Self), knowing this, the Self, and free from illusory knowledge, shake off all desires of progeny, &c., cherished, of necessity, by those who are still subject to illusion; and they lead a mendicant life for the barest necessaries of life. They have nothing else to do than resort to devotion to Self-knowledge.” (Bri. Up. 3-5-1).

That man, verily, who rejoices only in the Self, who is satisfied with the Self,
who is content in the Self alone, – for him there is nothing to do.

But that man – a samnyasin, the Sankhya, one devoted to Self-knowledge – whose joy is in the Self, not in the objects of the senses; who is satisfied only with the Self, not with food-essence, &c.; who is contented in the Self;

– all others derive contentment from possession of external things, whereas, disregarding these, he is content in the Self only and has no desire for anything; – for such a man, for the man who knows the Self, there is nothing to do.