“You can easily judge the character of a man by how he treats those who can do nothing for him.” – Johann Wofgang von Goethe, Novelist, Playwright, scientist and philosopher
“It is not the mountain that we conquer, but ourselves.” – Sir Edmund Hillary, The first man to reach the summit of Mount Everest
“Harsh words can be like nuclear bombs to relationships” – Royal Hamel, http://www.lightthedarkness.org/
Just as harsh words can destroy, kind words can energize relationships more than you can ever expect.
So choose your words wisely.