Closely related to criticism, complaining involves a lifestyle of pointing out and dwelling upon the negative, unfortunate, and difficult while excluding the positive and pleasant. At the foundation of this grumbling lifestyle lies a sense of entitlement in which we believe that the world, God, or society owe us a good time.
Replace complaining with gratitude. Gratitude flows from a heart that understands its unworthiness, in the face of which all good things become gifts rather than entitlements. It is helpful to think of three things for which one is grateful before going to sleep at night, and three more upon arising in the morning. A habit of this will almost always result in a complete cure.