Everything belongs to Krishna and it must be used in His service. Even your body and mind belong to Krishna and it must be used for Krishna's glorification. Otherwise, if you use your body or mind any other way, you will have to suffer so many future miseries such as rebirth, etc.
————Letter to Lata – Bombay, 19-March-1975
Whenever there is a young woman, we should remember Haridasa Thakura and beg his mercy to protect us, and we should think that these beautiful gopis are meant for the enjoyment of Krishna.
——–Letter to Gargamuni – Ahmedabad, 29-Sep-1975
The word love can be actually applied only in relationship with the Supreme Personality of Godhead. In the material world, love is not applicable at all. What goes on under the name of love in the material world is nothing but lust.
There is a gulf of difference between love and lust, like the difference between gold and iron. Both gold and iron are metals, but otherwise they are not at all alike.
———–Nectar of Devotion – Chapter 19
Regarding love affairs in the material world: they are only shadows or reflections of the real love with Krishna. If you love Krishna in any capacity, you shall never be frustrated because everything in Krishna is perfect, eternal, blissful, and full of knowledge.
———–Letter to Kanchanabala – Los Angeles, 14-Jan-1968