Lord Jigten Sumgön's Song on the Fivefold Mahamudra is pretty amazing. The metaphors, in particular, are quite evocative.
The following PDF includes the text in Tibetan, English, Mandarin (Chinese), and Korean:http://www.kagyumonlam.org/Download/TEXT/Fivefold_Mahamudra_textbook.pdf
"The Sutras, Tantras, and Philosophical Scriptures are great in number. However life is short, and intelligence is limited, so it's hard to cover them completely. You may know a lot, but if you don't put it into practice, it's like dying of thirst on the shore of a great lake. Likewise, it happens that a common corpse is found in the bed of a great scholar." ~ Karma Chagme དྲིན་ཆེན་རྗེ་བཙུན་བླ་མ་རཱ་ག་ཨ་སྱ་མཁྱེན་ནོ།