• A huge load

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  A mule may convey great learning by carrying a huge load of the best literature, but no-one will confer a doctorate on it!

• Buy

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  What is pleasant for one causes pain in another.
  Someone's pleasure is always bought at the expense of another's.

• Reaction

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  The situation outside is the same, but we react in the way that our own inner condition demands.

• Truth

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  The truth has to be discovered.
  The truth has not to be assumed and asserted.

• Solitude

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  True solitude is psychological and inward - the knowledge that you and I are alone in this world.