The only one at your side both then and now

A priest gave me a bit of wisdom the other day that I think worth sharing. A paraphrase:

You cannot change the past; do not dwell on it. Say a prayer for those whom you may have offended long ago; perhaps God has brought them to mind precisely because they need prayer. Offer your regrets to the only one who was at your side both then and now, and ask him to guide your future.

The context of what I was discussing with him probably matters. If I had been talking about "grave matter", the advice might well have been different!