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

The major dilemma in life arises when it is assumed that meaning is simply a greater degree of happiness, such that the more one indulges physiological needs, the more likely it is that life will be experienced as meaningful.

~ James Castleton