And sometimes it is a deliberate choice.
In the case of Du and Lu, later accounts suggest that their careful spending existed alongside a strong willingness to give.
They were not simply people who disliked spending money.
They were people who were highly selective about what they believed money should accomplish.
That distinction matters.
They could be extremely cautious when buying something for themselves and extraordinarily generous when helping someone else.
In other words, their relationship with money was not based only on saving.
It was based on purpose.
What Five Million Yuan Meant
Large charitable figures can become abstract.
Five million yuan.
Hundreds of thousands of U.S. dollars.
455 children.
Numbers of that scale can be difficult to connect to ordinary human experience.
But consider the couple's daily habits.
If a 17-yuan meal represented a normal purchase for them, a 5-million-yuan donation was equivalent to hundreds of thousands of such inexpensive meals.
The amount they were willing to give away dwarfed what they allowed themselves to spend on ordinary comforts.
And because the money was directed toward pediatric heart care, its significance was not measured simply by the amount transferred from one account to another.
Its purpose was medical treatment.
For the families involved, that could mean access to specialist care and procedures they desperately wanted for their children.
That is why the number 455 matters.
It transforms an impressive donation into a human story.
Congenital Heart Disease
Congenital heart defects are among the most common types of birth defects, according to major public-health organizations.
They affect the structure of a baby's heart and can influence how blood flows through the heart and to the rest of the body.
Some congenital heart defects are mild.
Others are critical and require treatment early in life.
Advances in diagnosis, pediatric cardiology and heart surgery have dramatically improved outcomes for many patients.
But medical capability is only useful when patients can reach it.
Financial assistance programs can therefore play an important role for families struggling with the costs associated with complex treatment.
Du and Lu were not surgeons.
They did not invent a new medical technology.
They could not personally repair a child's heart.
What they possessed was something much simpler:
Savings.
And they decided those savings could become part of the bridge between children who needed treatment and the medical professionals capable of providing it.
A Legacy Measured in Lives
Many people spend decades thinking about what they will leave behind.
Property.
Investments.
Businesses.
Possessions.
Du and Lu left something harder to display in a photograph.
Their legacy was distributed among hundreds of families.
A child receiving treatment does not carry a plaque with a donor's name.
Parents taking a recovering child home may never fully know the life story of the person whose donation helped make treatment possible.
And perhaps that anonymity suited Du and Lu.
Their generosity was consistent with the way they had lived: quietly.
There is a temptation when telling stories like theirs to describe them as saints or to turn their choices into a moral standard everyone else should follow.
That would miss the more useful lesson.
Their lives show how dramatically personal priorities can shape the meaning of money.
To one person, five million yuan might represent a more luxurious retirement.
To another, it might represent property or inheritance.
To Du and Lu, it became an opportunity to help children they did not know.