Pulling from my performance side a little*, here is a reading of one of my favorite essays - "Isaiah's Job."
Very inspirational and convincing to help you understand that you do not try to measure the good that your own personal mission may be doing. You don't know where and when its influences may manifest. And, just as you can not measure it, do not be discouraged for the want of evidence of its influence.
Those deep souls will find you. Your deep and important ideas will connect with those who are capable of receiving their meaning. 
Long live the Remnant.
This can be found on the Foundation for Economic Education's site. Fee.org 

2:00 Beginning of Recitation
3:14 740 BC
5:28 Two Definitions
7:07 A Job for Sale
9:25 The Best You Have
11:49 Right Thinking Must Exist
13:54 The Remnant Counted
15:56 The Approach
18:27 Rewards
20:50 They Are Slaves

*Yes, just as I really enjoyed my many stints on stage, another great vocation for me would be to be the voice for audio books.