When you listen to the Dhamma you must open up your heart and compose yourself in the center. Don’t try to accumulate what you hear or make a painstaking effort to retain what you hear through memory. Just let the Dhamma flow into your heart as it reveals itself and keep yourself continuously open to its flow in the present moment. What is ready to be retained will be so and it will happen of its own accord, not through any determined effort on your part.
This reflection by Ajahn Chah is from the book, No Ajahn Chah, (pdf) #28.