Trust gives happiness for two -
The one you trust and you.
Would you have friends, be a friend.
To your neighbors, friendship always lend.
What can be lost but never gained?
What can be spent but never earned?
What has no wings but quickly flies?
What has no feet but simply run?
What can we give but not receive?
What can we waste not retrieve?
Ecclesiastes 3:1-13
The answer is - Time