OK, I think I get it better now, thanks. Dogmas cannot be modified, and doctrines can, provided they don't contradict any dogmas and have been accepted by the Church. I have a memory from the L&E thread of needing to be careful of whether I called something a doctrine or a dogma, but I can't remember the context. I think I was speaking with a Catholic at the time. Perhaps it was about the celibacy of priests issue, but I can't remember. Oh well, I know now that you treat accepted doctrines as authority.
Celibacy is a discipline, not doctrine. So is fasting. Both particular Church traditions (East and West) require them to different degrees (Orthodoxy being stricter on fasting and the Roman Catholic side being stricter on celibacy of its clergy).
Both disciplines have their roots in Scriptures, but the Scriptures do not specify the degree to which they are to be practiced.
Discipline aims at resisting passions, as passions lead us into sin. How successful we are in those disciplines depends on one's spiritual state. How well we do is an indicator of where we are spiritually when it comes to resisting evil.
It is a litmus test of theosis, and is intimately connected with the Lord's commandment to repent. Our rejection of evil starts with true and honest repentance, and continues with disciplines that resist passions, confession, fasting, celibacy, etc.