Turning to the Yoga Sutras, we should first recall that all of the modifications of citta are said to be either [I]klista[/I] (causing suffering) or [I]aklista[/I] not causing suffering. Naturally, Yoga is concerned with minimizing those modifications of citta that cause suffering.
The particular [I]klesa[/I] (cause of suffering) that is relevant to the discussion is [I]asmita[/I], literally (and clumsily) translated as I-am-ness. The explanation of [I]asmita[/I] in the Yoga Sutras is arcane, (and cannot be understood without knowledge of Samkhya metaphysics).
Swami Hariharananda Aranya:
"Asmita is tantamount to the identification of Purusa or Pure consciousness with Buddhi."
The common feature of all the afflictions is erroneous cognition which is a source of pain
I.K. Taimni:
Asmita is the identity or blending together, as it were, of the power of consciousness (Purusa) with the power of cognition.
In my view, [I]asmita[/I] is egotism, a fundamental misconception about the nature of the self, leading to suffering. I believe that the passages in the Bhagavad Gita that I quoted previously are really talking about [I]asmita[/I]. It describes the [I]klista[/I] version of rajas, Samkhya describes the [I]aklista[/I] version.