What is Mind?

Student: What is mind?

SR: Mind? When you say “mind,” of course you have an idea of mind and body, or big mind and small mind. So there are various meanings. We mean many things by mind. It was a big problem for us. It has been, and still it is big problem. What is mind and what is our body? Material or duality or mind and body is the same. But in Buddhism, mind and body is two faces of one reality.

Excerpt from Shunryu Suzuki lecture 65-07-30-D as found on shunryusuzuki.com - Edited by DC 

[Left the "is" instead of "are" in those last sentences on purpose because he used that usage on purpose sometimes. - DC]