Unfortunately that file is gone. If anyone could upload it it would be a great help.
It presents a Japanese perspective of what constitutes the Buddha's teachings. I'm not sure if it really fits for the category of introduction since it contains many different levels of teachings without explaining the connection.
"There is no such thing as the real mind. Ridding yourself of delusion: that's the real mind."
(Sheng-yen: Getting the Buddha Mind, p 73)
“Don’t rashly seek the true Buddha;
True Buddha can’t be found.
Does marvelous nature and spirit
Need tempering or refinement?
Mind is this mind carefree;
This face, the face at birth."
(Nanyue Mingzan: Enjoying the Way, tr. Jeff Shore; T51n2076, p461b24-26)