Can someone explain what this quote means?

Question

“I suppose it is the teeming evidence that birth and growth, which we value, are ubiquitous and blind, that life itself is so astonishingly cheap, that nature is as careless as it is bountiful, and that with extravagance goes a crushing waste that will one day include our own cheap lives, Henle’s loops and all.” it is from the book Pilgrim at Tinker CReek

Answer 1

It's real meaning lies in your perspective.  Every day all around you people are born and people die.  It is so common-place that we rarely give it a moment's thought.  You will either be encouraged by this bounty  of life cycles, or you can be depressed by it.  A good example would be two sets of parents:  The first set lives a proper and decent life, desperately wishing to have a child, but cannot and feel like utter failures while the second set has another child every year while throwing them away or having them removed due to abuse or neglect.  Basically, this quote is telling you that Sh*t Happens.  THe Bible (Matthew 5:45) even says the rain falls on the just and the unjust.

Answer 2

The species that reproduces with free abandon are worth nothing more than the cockroach egg left to hatch in a tenament.  For if we are semi- successful, and not eaten off the bat, we too will be left to rot in our own excrement, crushed amongst the dead left behind, trying to feed that which cannot be fed.

Answer 3

Things die.  That's the simple answer.  

What's "Henle's loops"?  

That book is really deep and out there.  

The quote speaks of the cost of evolution, of how things are born yet do not survive.  It just keep doing it over and over.  No cost to the effort.