The concept of some things are slightly different these days.
The concept of free time.
With just one kid, I consider myself having free time when he falls asleep. Now my concept of free time is if none of the kids are crying.
The concept of what is expensive
I used to consider things expensive if they will not be put to full use. Now I get stuff even though only a little benefit can be accrued from them.
The concept of love
Love is not how often my kids say 'I love you mummy' but how quickly they calm down when I carry and talk to them.
The concept of safety
It is not how high they climb or how wide the gap they jump. But that they watch where they are climbing and how far the gap is before they jump.
The concept of long life
I don't really care how much I gain for myself in the next 47 years. But that I live healthily for the next 47 years to see my daughter become 46 years old.