There are so many lean Christians who devour hundreds of sermons!

(Edmund Calamy, 1600–1666)

"His delight is in the law of the Lord, and on His law he meditates day and night." Psalm 1:2

"I meditate on Your precepts and consider Your ways." Psalm 119:15

It is not merely hearing a sermon that does you good, but meditating on what you hear. So when you hear a sermon, if you do not meditate and ponder upon what you hear, you will never get any good.

There are so many lean Christians who devour hundreds of sermons-and are never any better, never any fatter in grace. They never meditate, ponder and consider what they hear-that is the reason why they are so lean in grace.

Pray unto God to enlighten your understandings, to quicken your devotion, to warm your affections-that by meditation on holy things . . .
  you may be made more holy,
  you may have your lusts more mortified,
  you may have your graces more increased,
  you may better behold the vanity of the world,
  you may lifted up to Heaven and eternal realities.

"Meditate upon these things." 1 Timothy 4:15

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You may want to read Edmund Calamy's insightful 11 point article, "Dangers of Neglecting Meditation".