Renunciation does not mean renunciation of duties in relation to the body and mind

From the purport to CC Ādi 4.170

The author of Śrī Caitanya-caritāmṛta advises everyone to give up all engagements of sense gratification and, like the gopīs, dovetail oneself entirely with the will of the Supreme Lord. That is the ultimate instruction of Kṛṣṇa in the Bhagavad-gītā. We should be prepared to do anything and everything to please the Lord, even at the risk of violating the Vedic principles or ethical laws. That is the standard of love of Godhead. Such activities in pure love of Godhead are as spotless as white linen that has been completely washed. Śrīla Bhaktivinoda Ṭhākura warns us in this connection that we should not mistakenly think that the idea of giving up everything implies the renunciation of duties necessary in relation to the body and mind. Even such duties are not sense gratification if they are undertaken in a spirit of service to Kṛṣṇa.

Knowing Krsna's Transcendental Nature Protects One from Material Contamination

SP purport to CC Adi 4.35

One who has not been attracted by the transcendental beauty of rasa will certainly be dragged down into material attraction, thus to act in material contamination and progress to the darkest region of hellish life. But by understanding :

1. the conjugal love of Rādhā and Kṛṣṇa one is freed from the grip of attraction to material so-called love between man and woman.
2. Similarly, one who understands the pure parental love of Nanda and Yaśodā for Kṛṣṇa will be saved from being dragged into material parental affection.
3.  If one accepts Kṛṣṇa as the supreme friend, the attraction of material friendship will be finished for him, and he will not be dismayed by so-called friendship with mundane wranglers. 
4. If he is attracted by servitorship to Kṛṣṇa, he will no longer have to serve the material body in the degraded status of material existence, with the false hope of becoming master in the future. 
5. Similarly, one who sees the greatness of Kṛṣṇa in neutrality will certainly never again seek the so-called relief of impersonalist or voidist philosophy. 

If one is not attracted by the transcendental nature of Kṛṣṇa, one is sure to be attracted to material enjoyment, thus to become implicated in the clinging network of virtuous and sinful activities and to continue material existence by transmigrating from one material body to another. Only in Kṛṣṇa consciousness can one achieve the highest perfection of life.