"The surest way to turn a friend into an enemy is to give him an undeserved gift, send him money when he is in a desperate situation or save him from distress. His gratefulness will darken your relationship. Somehow he will feel inferior, and sooner or later take action to prove that you are the inferior one. In short, something meant as a blessing will upset the balance and ruin your friendship. Tragically you will never learn to let down a friend in need."
Joshua Fry Speed