about life's secrets - LIFE as YAJNA

I have been reading a book about "the Five secrets you should know before you die" , by JOHN IZZO.
On of the secrets is ' GIVE more that you TAKE"
This is also the secret of living life as a yajna (sacrifice)as per our Indian philosophy.
For example is there any person in the world who has completely redeemed his debt to his mother?
Hence we have the concept of sacrifice for society "nruyajna" so that when we are children, we take much from the society, when are adults we should aim to give back.
Looking at society as a by stander I see many people who are past middle age , but still are good at taking rather than giving.
The concept in the Semitic religions of DZAKATT also connotes the same thing .
True happiness comes from being a giving person.
But society names such people as FOOLS.
TRY GIVING, THEN YOU WILL LEARN THE HAPPINESS OF LIFE AS YAJNA .
This I say from experience .
just try to give your seat to an old man in a bus even if it means that you have to stand for 2 hours in the bus for the rest of your journey.Help someone carrying a heavy load.Lend your ear to a person in difficulty.
You will find true happiness.