You are correct in that both the concept of forgiveness and emotions don't really exist - it is a concept, a thought. And, just like emotions, we have some physical 'reactions' to those things caused by our brain triggering chemicals. For instance, based on some evolutionary reason I've never investigated to be honest, when I think of a friend who died while listening to our favorite song, I tear up, I cry. The tears are a reaction to the brain altering hormones, biochemicals, etc...
My "sadness" doesn't really exist, not outside of my own brain and synapses firing in different parts than normal. My tears are real as a physical reaction. But, it is not a "manifestation", which denotes creation or copying from an original something.
"In the beginning of a change the patriot is a scarce man, and brave, and hated and scorned. When his cause succeeds, the timid join him, for then it costs nothing to be a patriot."--Mark Twain
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