There is almost nothing more insidious and decaying to a good mind than to replace saying what you believe with what you think you should say.
The first joke is the point here (watch):
The trick to learning is to say what you think…and then, decide if you’d rather let that thought go and pick up another one. Studying the Bible works this way…people decide what it should say, say that, and then spend their time looking up verses to support it. It is the same with many historians and reporters… all busy proving a point rather than learning one.
The better system is to stay a humble learner…keep giving up on your own faulty ideas! Eventually, you’ll get smart (maybe even wise!).