Pleasure

There are tiers of living. Rising to challenges on life means rising to different tiers in life. You raise yourself to meet the level of life. You aren’t meant to be happy where you are, you are meant to self improve and life shows you where to improve. 

Self improvement is simply dealing with the challenges of life. If it gets hard, then you’ve found another tier to rise to. 

It’s unsatisfying to stay where you are, even if it’s pleasant, too much pleasant becomes unbearable. Remember this. Too much pleasure is agony. Self improvement is the point of life, not pleasure.