I'll remember this happy event as long as I live.
Happiness means different things to different people.
Happiness could not be bought with money.
For me, my happiness is closely tied to my family.
I'll never forget the day that event happened.
As the saying goes, extreme joy begets sorrow.
Those who are easily content are always happy.
Happiness should not be achieved at the expense of others' interests.
For me, working is the source of happiness.
I was having the time of my life.
We had a whale of a time at that party.
When I heard the news I was as happy as a lark.