The physical organism, your body, has its own intelligence, as does the organism of every other life-form. And that intelligence reacts to what your mind is saying, reacts to your thoughts. So emotion is the body’s reaction to your mind. The body’s intelligence is, of course, an inseparable part of universal intelligence, one of its countless manifestations. It gives temporary cohesion to the atoms and molecules that make up your physical organism. It is the organizing principle behind the workings of all the organs of the body, the conversion of oxygen and food into energy, the heartbeat and circulation of the blood, the immune system that protects the body from invaders, the translation of sensory input into nerve impulses that are sent to the brain, decoded there, and reassembled into a coherent inner picture of outer reality. All of these, as well as thousands of other simultaneously occurring functions, are coordinated perfectly by that intelligence. You don’t run your body. The intelligence does.
—  Eckhart Tolle

don’t let a bad grade make you think any less of yourself.