The most important resource is time.
It is possible to get more resources like money through various avenues but once the time is gone, it’s gone forever.
It is not possible to buy more or borrow more, so time is a limited resource that expires every day.
People should be very careful with this precious resource.
Sustainability in Action (SiA) teaches people to master their time or and to avoid being a slave to it.
Because time is the most valuable resource and must be guarded carefully or people won’t have enough of it.