“The ego and all its works” is a reference to traditional Christian baptismal vows, which ask, “Dost thou renounce the devil and all his works, the vain pomp and glory of the world, with all covetous desires of the same, and the carnal desires of the flesh, so that thou wilt not follow nor be led by them?” In the above passage, “the devil” has been replaced by “the ego,” which implies that the ego is devilish and that its works are the vanity of the world and covetous and carnal desires.
