It should capture the readers attention and state the main idea
Use phases that aid you in memorization of the certain word it's called mnemonics. Such as, "MY Very Excited Mother Just Served Us Nine Pies" to remember "Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, & Pluto." (Planets closest to the sun going away from it.) Also PEMDAS but everyone knows that.
Answer: a mixture of pure motivation to accomplish goals and the hopelessness of humanity
Explanation: your welcome