Really effective people are able to partition the emotional events in their life.
They can have a really bad morning but still show up for that employee lunch meeting and beam with energy and positive enthusiasm.
They can scream at someone on the phone one minute but become totally composed and serene during the next call.
My analogy is the Titanic. I think not letting any single emotional event hijack your day is critical. Being in the moment depends on partitioning. When I let one issue dominate my mental resources, or carry over my anger from yesterday to today, my effectiveness plummets. It’s not easy, but it’s a skill we should all work on.