व्यवसायात्मिका बुद्धिरेकेह कुरुनन्दन ।
बहुशाखा ह्यनन्ताश्च बुद्धयोऽव्यवसायिनाम् ।। २-४१ ।।

vyavasāyātmikā buddhir-ekeha kuru-nandana |
bahu-śākhā hy-anantāś-ca buddhayo’vyavasāyinām || 2.41 ||

Viveka and Vairagya - the dawning of Yogabuddhi

In this Karmayoga practice, says Krishna, one point that supremely counts is ‘resoluteness of the buddhi’ (verse 2.41):

The saadhaka’s buddhi must remain firm, resolute and exclusive in its assessment and finding. The intelligence begins to think and evaluate matters relating to life in this world and the next, and finally becomes very clear as to what ultimate value all these have.

Finding the body as well as all the body-related attainments and gains to be ephemeral, the buddhi becomes firm about the futility of chasing the fleeting objects and gains. To seek the unfleeting, it turns inward and focuses on the Self. Leaving the distant and doubtful, the buddhi with conviction turns to what is already there within - in the from of Consciousness, enabling us to sense and perceive everything else.

This kind of resoluteness of intelligence, and not any other religious practice or study, is what marks the life of a Karmayogin. As is the buddhi solely important in Sankhya pursuit, so is the same buddhi supremely significant in Karmayoga. Sankhya and Yoga are equally buddhi-based. One should not miss this basic point.