A study that followed 1,000 New Zealanders until they reached the age of 45 discovered that those who regularly threw temper-tantrums as a child tended to have financial difficulties later in life. The researchers believed this was because they had not learned self-control early as a child.
The Daily Mail explains:
Troublesome children who have short tempers and regular tantrums are likely to run into trouble when they become middle-aged adults, a new study has found.
More than 1,000 people from New Zealand born in 1972 and 1973 were tracked throughout their life until the age of 45.
Analysis of the data revealed individuals with greater self-control as children were more able to adequately manage their finances.
Individuals who exhibited high self-control in childhood also physically age slower, the study found.
I think there is a Bible verse that basically says the same thing:
6 Train up a child in the way he should go: and when he is old, he will not depart from it. (Proverbs 22:6 KVJ)