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 BuddhaKnow all things to be like this: A mirage, a cloud castle, A dream, an apparition, Without essence, but with qualities that can be seen. Know all things to be like this: As the moon in a bright sky In some clear lake reflected, Though to that lake the moon has never moved. Know all things to be like this: As an echo that derives From music, sounds, and weeping, Yet in that echo is no melody. Know all things to be like this: As a magician makes illusions Of horses, oxen, carts and other things, Nothing is as it appears.
Gautama BuddhaThe poisonous serpent of afflictions is sleeping in your mind; just as if a black viper were asleep in your room. You must use the hook of precepts to quickly remove it. When the sleeping snake is gone, then you can rest at ease.
Gautama BuddhaBe it known that Men of dull faculties and slight wisdom, They who cling proudly to signs, Cannot believe in this Dharma. Now I, joyfully and fearlessly, In the midst of the bodhisattvas Frankly casting aside my expedient devices, Merely preach the Unexcelled Path.
Gautama Buddha