P33 Because the partial theories that we already have are sufficient

Because the partial theories that we already have are sufficient to make accurate predictions in all but the most extreme situations,
the search for the ultimate theory of the universe seems difficult to justify on practical grounds.
(It is worth noting, though, that similar arguments could have been used against both relativity and
quantum mechanics, and these theories have given us both nuclear energy and the microelectronics
revolution!)
The discovery of a complete unified theory, therefore, may not aid the survival of our species.
It may not even affect our lifestyle.
But ever since the dawn of civilization, people have not been content to see events as unconnected and inexplicable.
They have craved an understanding of the underlying order in the world.
Today we still yearn to know why we are here and where we came from.
Humanity’s deepest desire for knowledge is justification enough for our continuing quest.
And our goal is nothing less than a complete description of the universe we live in.

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My comments:
Can we understand every thing in the Universe ?
Can we find laws that explain everything ?
We would not know the answer.
And we can not see everything in the universe in a limited time.

But we can not stop thinking and observing the universe.