B.G 13.19
इति क्षेत्रं तथा ज्ञानं ज्ञेयं चोक्तं समासतः। मद्भक्त एतद्विज्ञाय मद्भावायोपपद्यते ॥१९॥
Thus, the field, knowledge, and the knowable have been described briefly. My devotee, by understanding this, attains the ability to feel my presence within.
Gīta Bhāshya 13.19
At first, when the practitioner is still of a distorted nature, the means to be employed was instructed. The current verse describes the effect of devoutly employing such means.
विकारान्तर्भावात् ज्ञानसाधनं प्रथमतः उक्तम्। बहुत्वात् साधनात्युपयोगात् प्रभावः ॥१९॥
At first, because of distorted nature, the means of knowledge was spoken. The effect arises from the use of means with excessive striving.
Gīta Tātparya 13.19
'madbhāvāya' - capacity to perceive or feel of my state within.
मद्भावाय मयि भावाय ॥१९॥
The word 'madbhāvāya' is split into 'mayi bhāvāya', i.e. the feeling of my state within.