Discipleship under Guthlac
Felix's Life describes Bettelin's long service to Guthlac, traditionally numbered at fifteen years. The most often-repeated episode recounts a period of spiritual struggle early in his discipleship, in which he was beset by murderous thoughts against his master while attending to him; the tradition holds that the temptation was overcome through Guthlac's prayer and counsel. The same sources relate that Bettelin witnessed visions of light at the time of Guthlac's death.