The mind is the source of happiness and unhappiness by what it chooses to compare the experience with. If it chooses to compare it to something worse then it will create happiness, gratitude and pride but if it chooses to compare it to something better then it will create unhappiness, bitterness and envy.
Gautama BuddhaYet the Teaching is simple. Do what is right. Be pure. At the end of the way is freedom.
Gautama BuddhaA virtuous man or woman who is determined to develop the Supreme Enlightened Mind, should thus develop it: I have to lead all living beings to put a stop to (reincarnation) and escape (suffering), and when they have been so led, not one of them in fact stops (reincarnating) or escapes suffering. Why? Because, if a Bodhisattva believes in the notion of an ego, a personality, or a living being, he is not a true Bodhisattva.
Gautama Buddha