"Just so, Subhuti, I obtained not the least thing from unexcelled, complete awakening, and for this very reason it is called 'unexcelled, complete awakening.' "
-- The Buddha.
The first thing to appreciate about Zen is that it's easy. The second thing to appreciate is that it's incomprehensible. A contradiction? Only if you insist on trying to understand. To be enlightened is to resign yourself to -- no, to delight in -- incomprehension.