Use discretion when 'not forgetting' though, yes it may be wise, but also not, depending on the situation.

The idea is by not forgetting, we are continuously living in the past, which doesn't matter. The Now is the only true reality. Most people identify with their past or future in regards to whom they are, and carry that baggage around, destroying them slowly, they are not that. We should be independent of the Good or Bad opinion of others. You are who you are NOW.

With that, understanding time is an illusion helps break that 3d thinking. The Now is again, the only reality that matters. There's clock time and psychological time, one is useful, one is not. :) So in my humble conclusion: SOMETIMES FORGET.