Shunryu Suzuki November 30 1966

""Dogen-zenji said, “You should establish your practice in your delusion.”  Even though you think you are in delusion but there is your pure mind.  So, if you realize the pure mind in your delusion that is practice. If your have the pure mind, the essential mind, in your delusion – delusion will vanish.  It cannot stay when you say, this is delusion.  He will be very much ashamed of it.  He will run away.  So you should establish your practice in your delusion.  To have delusion is practice.  “To attain enlightenment before you realize it.”  So you will attain enlightenment before you realize it.  Even though you do not realize it, you have it.  So, when you say ‘This is delusion’ that is enlightenment.  But when you try to expel the delusion it will stay and your mind will become busier and busier to cope with the delusion you have.  That is not so good.

Just say, ‘this is delusion’.  That is enough and don’t be bothered by it – ‘oh, this is just delusion’.  When you see delusion you have your true mind – calm, peaceful mind.  When you start to cope with it you will be involved in delusion.  So, when you sit, whether you attain enlightenment or not – just to sit is enough.  When you try to attain enlightenment, then you have big burden in your mind.  So your mind will not be clear enough to see things as they are.""

http://suzukiroshi.sfzc.org/dharma-talks/?p=552