Board Thread:Off Topic/@comment-31106929-20170121093045

Hi, the anime ep1 starts with reciting of 五省. Assuming there are people here with the knowledge, could someone briefly explain the grammar used in it?

至誠に悖る勿かりしか

I assume it's somewhat archaic. In a simpler way it might perhaps be  至誠に悖りましたか or  至誠に悖ったことがありますか ...

The first half is kinda clear ... ~ (to sincerity) oppose; か should be the question marker and 勿かり seems related to 勿れ but I don't recall seeing れ <=> り changes and just not sure how it works anyway. し is maybe stem of する, but I don't know what's it doing there.

Sorry if it's too much OT and I should take it away to stackexchange...

Thank you  