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Now,if you believe that the universe is not arbitrary,but is governed by definite laws you ultimateky have to combine the partial theoris in to a complete infield theory that will describe every thing in the universe ,Because the partial theories that we already have are sufficient to make accurate preductions in all but the most extreme situations the search for the ultimate theory of the universe seems difficult t justify on practical grounds .(It is worth nothing through 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 acomplete unified theory ,therfore may not aid the surviaval of our spices.It may not even affect our lifestyle .But ever since tha dawn of civilization ,people have not been content to see events as unconnected and inespcable .They have craved an understanding of the underlying order in the world.