The sentence that contains an unnecessary shift in verb tense is the second one - Lee noticed a problem and alerts a teacher.
It should be <em>alerted, </em>which is the past tense as the first verb <em>noticed.</em>
This quote means that humans can always find a flaw in someone else in order to make themselves bigger than others. People refuse to let go of flaws, they believe in an idea of perfection and so we say blue eyed blondes are beautiful versus saying we are all beautiful in our own way.
In simpler terms, we refuse to see our differences as perfect.
Many things can be learned from a journey. You can learn from your mistakes and learn to not make the same mistakes. You can also learn alot of things about yourself, depending on what the journey is.
