Killing the Buddha
If you meet the Buddha, kill him. (逢佛殺佛，逢祖殺祖)
Thinking about the Buddha as an entity or deity is delusion, not awakening. One must destroy the preconception of the Buddha as separate and external before one can become internally as their own Buddha. Zen master Shunryu Suzuki wrote in Zen Mind, Beginner’s Mind during an introduction to Zazen,
Kill the Buddha if the Buddha exists somewhere else. Kill the Buddha, because you should resume your own Buddha nature.
One is only able to see a Buddha as he exists in separation from Buddha, the mind of the practitioner is thus still holding onto apparent duality.