This includes the need to maintain chastity, a test Perceval passes when he "has a close call with sexual temptation: slipping into bed with a demon in alluringly feminine form, he is only saved when his glance falls on the red cross inscribed on his sword pommel. The 'lady' and her silk tent disappear in a flash and a puff of smoke, leaving the tell-tale sulphurous stench of hell. A distraught Perceval stabs himself through the left thigh in penance" (Kaeuper 258). Such ability to resist is the mark of a knight, though many of the stories also suggest that the knight often fails this test at some point and then has to do penance to make up for his failure.

Whether the Grail derives from Christian ideas first or from Celtic images and stories, over time the idea of the Grail did become more associated with Christian symbols so...
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