This quote from Hans Margolius speaks to the universal truth that the human mind is at its best when it is not clouded by emotion:
Only in quiet waters things mirror themselves undistorted. Only in a quiet mind is adequate perception of the world.
Hans Margolius
If you are a student of philosophy, you may recognize this idea as one that reflects the teachings of Stoicism. The Stoics were not against feeling or emotion but for seeing the world accurately, living by reason, and staying detached from external influences.
For practical use in daily life, try your best not to make comments to others or make important decisions in life while under the influence of extreme emotion. Let the feelings come but wait until they have calmed before you begin engaging with matters of high importance again.