CC Ādi 4.164
লৌহ আর হেম যৈছে স্বরূপে বিলক্ষণ ॥ ১৬৪ ॥
lauha āra hema yaiche svarūpe vilakṣaṇa
Lust and love have different characteristics, just as iron and gold have different natures.
One should try to discriminate between sexual love and pure love, for they belong to different categories, with a gulf of difference between them. They are as different from one another as iron is from gold.