तत्रैवं सति कर्तारमात्मानं केवलं तु यः।पश्यत्यकृतबुद्धित्वान्न स पश्यति दुर्मतिः
tatraivaṁ sati kartāram ātmānaṁ kevalaṁ tu yaḥ paśhyaty akṛita-buddhitvān na sa paśhyati durmatiḥ
But the fool, who, due to his immature judgment, supposes that it is his own Self alone that acts, perverts the truth and does not see rightly.
Translated by Shri Purohit Swami
Now, such being the case, verily he who, owing to an untrained understanding, looks upon his Self, which is isolated, as the agent, he of perverted intelligence does not see.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
tatra—there; evam sati—in spite of this; kartāram—the doer; ātmānam—the soul; kevalam—only; tu—but; yaḥ—who; paśhyati—see; akṛita-buddhitvāt—with impure intellect; na—not; saḥ—they; paśhyati—see; durmatiḥ—foolish