God grant me the serenity to accept that people are ignorant, the courage to uphold the law when I'm hostile, & the wisdom to realize that murder is illegal.
If you have only one smile in you, give it to the people you love. Don't be surly at home, then go out in the street and start grinning 'Good morning' at total strangers.
Books are totally useless unless you take their advice. If you just keep reading them, thinking "that's so insightful! that changes everything," but never actually doing anything different, then pretty quickly the feeling will wear off and you'll start searching for another book to fill the void.
Time and tide wait for no man. A pompous and self-satisfied proverb, and was true for a billion years; but in our day of electric wires and water-ballast we turn it around: Man waits not for time nor tide.