Generally, we work for our sense gratification: "I have got this money. I must use for my sense gratification or for my relative's sense gratification or for my country's sense gratification, for my society's sense gratification." So this is materialism. But when the same thing is turned for Kṛṣṇa's sense gratification, that is spiritual.
That is the difference between prema and kāma. Kāma. It has been very simplified by Kavirāja Kṛṣṇadāsa Gosvāmī in his Caitanya-caritāmṛta: ātmendriya-prīti-vāñchā karanam 'kāma' (CC Adi 4.165). Ātmendriya-prīti. If you want to satisfy your senses, that is called kāma, lust. Kṛṣṇendriya-prīti-vāñchā dhare 'prema' nāma. The same thing, when you try to satisfy the senses of Kṛṣṇa, that is called prema.
So we have to divert the activities for Kṛṣṇa. That is Kṛṣṇa consciousness. Just like Arjuna. Arjuna, he, in the beginning, he denied to fight. That, our subject matter. He was crying. "No, no, I cannot fight." So apparently Arjuna was very nice gentleman that he is forgetting his claim over the kingdom, he's nonviolent, he's not willing to fight with his brothers, and he was crying so compassionate. So from materialistic point of view, he was very nice. But immediately, as we'll begin tomorrow, Kṛṣṇa says that, "Why you are thinking like anārya?" Anārya. Anārya-juṣṭam. "This kind of thinking is not for āryas, Āryans. It is for the non-Āryans."