The Pie Jesu is the last verse of the Sequence, Dies irae. No other chant version exists that I know of. Sometime in the 19th century, it became a votive solo aria or motet following the consecration at Requiem Masses, and was usually the only part of the Sequence set polyphonically. There may be a hymn setting, but I don't know where.
A little learning is a dangerous thing;
drink deep, or taste not the Pierian spring:
there shallow draughts intoxicate the brain,
and drinking largely sobers us again.
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