Books are the vast storage of knowledge. Numerous books are available on varied subject. One can gain indepth knowledge by reading varied books on that topic. This will give the individual broader and richer view on that topic. However, untill and unless he implement his knowledge in his practical life, the knowledge gained will be of no use. For instance, the Lawer has to read varied books during their professional life. He needs to know the broader and perspective view of each and every law he studies. But his knowledge will be of no use untill he implement it. It is through experince that he will come to know where to apply the particular law or any penal code. So his knowledge about law will follow the use of it in practical life.
There are certain other example to support this point. An engineering student will use his knowledge gained through reading the books on engineering subject in an industry. Doctors, scientist, bureacrats, etc all needs to first go through books on their choosen subject and later on the knowledge gained through this will help them to implement it in day to day life.
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However, there are certain things which can be gained through years of experince. But in the long the term that may not be that much helpful. For instance, take the case of share broker who has a little knowledge about the stock exchange terms. However, his vast experince in the long term help him to cope up with all the ups and down in the share market. But his experince will be of a little help if he does not know some of the crucial terms and will put him in jeopardy. Such crucial terms can be gained through reading the books only and not through experinced.
In sum, it is the experinced gained after reading the books that gives indepth knowledge of certain thing. Knowledge through books and experinced after that are process which follows one after another. Indepth knowledge about certain thing can be obtained after implementing your knowledge gained through reading books.