• The sure way to handle any emotion including guilt is to be a witness.
• Just watch it. Hindus call it being a sakshi.
• Don’t do anything. Anything done under the impact of a negative emotion is bound to be wrong.
• Later guilt will arise.
• Just be a watcher, a witness.
• See it. It is there.
• You are not it. You are only the witness. You will be surprised how it goes away. It cannot be there forever.
• By its very nature, the mind will change state. In a few minutes the guilt will go and leave no trace behind that it ever existed.

source: Living Enlightenment