Smiling

Question: 
I find that smiling as I meditate really makes it very enjoyable for me. Is it OK?
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Answer:
Of course it is.

The vital thing is that you should not look forward to that pleasure during meditation, because your pleasure-seeking mind will lead you astray.
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In fact, when you meditate without any expectations, without any pretensions, that is when you get the most pleasure and fulfillment out of it. Why? Because your seeking mind limits your potential. Don’t forsake the unlimited for the limited.