Sons and daughters are the most precious treasure we ever have. Beside of knowledge and Faith to God who create the universe, children is the most precious treasure. Because other of them such as wealth, woman (wives), and earthly pleasure will be our burden. But knowledge shall keep us from danger, faith to God will keep us from hell, filial children always pray for goodness for their parents.
That is why Knowledge, Faith to God, filial Son and daughters is the most precious treasure you and I ever have.