[giftplas]

1. Mind.

2. Not all things have a cause (preceding cause or hetu). For example, ignorance does not.

Similarly, the law of causality does not have a cause. It is inherent.

[/quote]

Or is the cause of ignorance Mara?
http://www.buddhismwithoutboundaries...39348#msg39348

Or is it difficult to determine what comes first?
Or are cause and effect one? (which is the same as what you mean by inherent, I guess)