"Contentment, therefore, comes in part from faith – that is, from knowing the purpose of life and being assured that whatever the trials are, they come from the hand of a loving Father. Secondly, in order to have contentment one must also have a good conscious. If the inner self is unhappy because of moral [...]
"One of the greatest mistakes is to think that contentment comes from something outside us rather than from a quality of the soul. Trying to make a discontented person happy is like trying to fill a sieve with water. However much you pour into it, it runs out too rapidly for you to catch up." [...]
"Contentment is not an innate virtue. It is acquired through great resolution and diligence in conquering unruly desires; hence it is an art which few study." Source: Ven. Fulton J. Sheen, Way to Happiness, St. Pauls, 1998.