James Castleton said this quote

Happiness is the sense that my life is good because my biological needs are being met. Meaning is the sense that my life is significant because it has met the needs of another. Happiness bestows the feeling that I am whole. Meaning bestows the feeling that I matter and am valued. Happiness is an event, and meaning is a state. Happiness is the means to an end; meaning is an end in itself. Happiness fades; meaning accumulates.

~ James Castleton

Because I did not understand the difference between meaning and happiness, I did not appreciate that life could be meaningful without being happy. I didn’t understand that meaning and happiness are occasionally opposed, such that the self-sacrifice that yields meaning may come at the cost of the very things on which happiness most depends. I erroneously assumed that if I were unhappy then my life lacked significance.

~ James Castleton

Thoroughly selfish individuals can be entirely happy. They will be unlikely to find life very meaningful. To such individuals, meaning often seems accidental, coincidental, or tangential … The reason this is so is that selfish people will find life meaningful only when they are not themselves; when they forget their selfish desires and act in a manner more consistent with agape (selfless love). Meaning seems accidental, coincidental or tangential to their lives because, by and large, selflessness is accidental, coincidental and tangential to their lives. There is nothing unpredictable about meaning, only the presence of selflessness in the life of a selfish person.

~ James Castleton

Happiness is true, even though it fades, and meaning is also true, despite the fact that it endures. Those experiences that define what it most means to be human are true not because they endure, they are true because they are meaningful. Being human is not about being happy, not because happiness fades, but because the apex of the human experience is not happiness but meaning. Meaning endures not because it is true but because it is not dependent on circumstance. Happiness is transient not because it is false but precisely because it is dependent on circumstance. Each emotional experience is true in its proper domain. What makes one fleeting and the other lasting is not truth but the fact that one belongs to the temporal and the other to the eternal.

~ James Castleton