Koan
No mind no buddha
A monk asked Mazu, "What is Buddha?" Mazu said, "No mind, no Buddha."
The Gateless Gate, case 33
How to sit with it
Mazu gave opposite answers to the same question. Hold both and see what loosens.
Read it once more, slowly. Then sit for two minutes and let it stay in the background. There is nothing to solve. New to this? Read what a koan is.