Verily there is no purifier in this world like knowledge. One who becomes purified by Karma-yoga discovers this knowledge within (naturally) in course of time. (See also 4.31, and 5.06).

When your mind becomes fixed on Me, you shall overcome all difficulties by My grace. But, if you do not listen to Me due to ego, you shall perish.

My limbs fail and my mouth becomes dry. My body quivers and my hairs stand on end.

Seeing fathers-in-law, all those kinsmen, and other dear ones standing in the ranks of the two armies, / Arjuna was overcome with great compassion and sorrowfully said: O Krishna, seeing my kinsmen standing with a desire to fight, / My limbs fail and my mouth becomes dry. My body quivers and my hairs stand on end.

Thus this most secret science has been explained by Me, O sinless Arjuna. Having understood this, one becomes enlightened and one's all duties are accomplished.

All these (seekers) are indeed noble, but I regard the wise as My very Self, because the one who is steadfast becomes one with the Supreme Being.