Devotee: Prabhupāda? Is it possible for one to engage himself in bhakti-yoga without rendering service to Kṛṣṇa? Let's say someone who...
Prabhupāda: Without Kṛṣṇa, where is bhakti?
Devotee: Well, someone is worshiping Lord Buddha or Lord Jesus...
Prabhupāda: That is not bhakti-yoga. Bhakti-yoga is simply in connection with Kṛṣṇa. Bhakti-yoga cannot be applied to anyone, anything else. How Buddha philosophy can be dovetailed with bhakti-yoga? Bhakti-yoga means to understand God. Bhaktyā mām abhijānāti. You'll find in the Bhagavad-gītā, Eighteenth Chapter. By bhakti-yoga you can understand Lord, the Supreme Lord, God. But in Buddha philosophy there is no God? That you know? So where is bhakti-yoga?
Devotee: In the case of Christians, some of them worship Jesus Christ.
Prabhupāda: That is bhakti-yoga. Because they accept God. Unless you accept God there is no question of bhakti-yoga. So Christian religion is also Vaiṣṇavism because they accept God. Maybe in the, some stage different from this. There are different stages of God realization also. The Christian religion says "God is great." Accept! That is very good. But just how great God is, that you can understand from Bhagavad-gītā and Śrīmad-Bhāgavatam. But there is acceptance that God is great. That is therefore that is beginning of bhakti. You can apply that bhakti. Even the Mohammedan religion. That is also bhakti-yoga. Any religion where God is the target, that is applied in bhakti. But when there is no God or impersonalism, there is no question of bhakti-yoga. Bhakti-yoga means bhaja jayukti bhaja-sevayā(?). Service. Service means three things: the servitor, the served, and service. One must be present who will accept service. And one must be present to render service. And in the via media, the process of service. So bhakti-yoga means service. If there is nobody to accept the service, then where is the bhakti-yoga? So any philosophy or religious principle where there is no acceptance of God, the Supreme, there is no application of bhakti.