B.G 5.23
śaknotīhaiva yaḥ soḍhuṁ prāk śarīravimokṣaṇāt। kāmakrodhodbhavaṁ vegaṁ sa yuktaḥ sa sukhī naraḥ ॥23॥
He who is capable of withstanding the impetus arising from desire and anger, here, in this world, alone is properly engaged and is a happy human.
Gīta Bhāshya 5.23
The renunciation is praised again. It is very difficult to withstand desire and anger in the human body, but must be practiced.
tatparityāgaṁ praśaṁsayati - 'śaknoti' iti।
That renunciation is praised again by 'śaknoti' verse.
kāmakrodhodbhavaṁ vegaṁ soḍhuṁ śaknoti, śarīravimokṣaṇāt prāk, yathā manuṣyadehe soḍhuṁ suśakaḥ tathā nā'nyatra iti bhāvaḥ। brahmalokādistu jitakāmānāmeva bhavati ॥23॥
'Is capable of withstanding the impetus arising from desire and anger, before being free from physical body' - the expression indicates it is very difficult to withstand desire and anger in the human body, but must be practiced here only, and not elsewhere. The realm of Brahma and other worlds are possible for only those who have already conquered desire.