If you continue in Krsna consciousness, you will see that nothing is material. When you offer a flower to Krsna, it is not material. Krsna will not accept anything material. And this does not mean that the flower is material on the bush, and then it becomes spiritual when you offer it to Krsna. No. The flower is "material" only as long as you think that it is made for your enjoyment. But as soon as you see that it is for Krsna's enjoyment, you see it as it really is - spiritual.
The Tenth Morning Walk, Cheviot Hills Park, Los Angeles, May 14, 1973