[goodpoint]

That does not make it less selfish.

Imagine putting the same sacrifice in donating money or otherwise contributing to a charity that does important work.

And you only get a "thank you" letter. Does it feel the same?

If you are as selfless as you said it should not make a difference.

[logical_ferry]

I don't know, I have never put in the same sacrifice/money to charity.

[goodpoint]

...hence the keyword "imagine".

Plus, you make strong claims like "nothing less selfish" and yet you have never made sacrifices for anything other than kids... maybe there's something to think about.

[logical_ferry]

Imagine, making sacrifices for your kids and not for the Amazon forest.