"Simplicity is hard work."

"The extra ten minutes of sleep before school is worth it."

"Keep it real."

"Invest in people. It'll give you better returns than the stock market."

"Three things cause frustration: incomplete communication, thwarted intentions, and unfulfilled expectations. Get clarity on what is pissing you off, and then you can deal with it." 

Also: "Follow your heart and you'll never go wrong."