I see you, you see me. I touch you, you touch me. I taste something. This is gross. Above this gross there is mental platform. So mantra is also on the mental, which is little above intelligence and above that there is spiritual platform. So if on the mental platform, the mantra can act so wonderfully, how much spiritually the mantra can benefit you. You have to simply imagine. So this Hare Krishna mantra is completely spiritual. If you chant it, spiritually enlightened, then surely it will act.
Lecture on Srimad-Bhagavatam 1.7.19 — Vrndavana, September 16, 1976