Yesterday was heavy. I felt drained of energy and my thoughts moved in hopeless spirals. Luckily I knew that "this too shall pass".
Everything that happens will pass. Every situation, object, or living being is constantly changing, and will eventually pass (away). Perhaps that is not what we want to happen to what we like, but it is very consoling when we are facing difficult times or situations.
But why should we like impermanence, or dislike it? Life goes on anyway, and it does not care about our opinions. They only complicate our experience.
And this too passed. Next morning, life was smiling at me again :-)