As for you, the anointing which you received from him remains in you, and you don't need for anyone to teach you. But as his anointing teaches you concerning all things, and is true, and is no lie, and even as it taught you, you will remain in him.

 The first question is easy to answer. There was only one ceremony that all Christians passed through, and that was baptism; it was, indeed, in later days the standard practice at baptism to anoint Christians with holy oil, as Tertullian tells us. 