You are what you read

...reading a great work for the first time when one is fully adult is an extraordinary pleasure, one which is very different (though it is impossible to say whether more or less pleasurable) from reading it in one's youth. Youth endows every reading, as it does every experience, with a unique flavour and significance, whereas at a mature age one appreciates (or should appreciate) many more details, levels and meanings. We can therefore try out this other formulation of our definition [of a classic]:

2. The classics are those books which constitute a treasured experience for those who have read and loved them; but they remain just as rich an experience for those who reserve the chance to read them for when they are in the best condition to enjoy them.

For the fact is that the reading we do when young can often be of little value because we are impatient, cannot concentrate, lack expertise in how to read, or because we lack experience of life. This youthful reading can be (perhaps at the same time) literally formative in that it gives a form or shape to our future experiences, providing them with models, ways of dealing with them, terms of comparison, schemes for categorising them, scales of value, paradigms of beauty: all things which continue to operate in us even when we remember little or nothing about the book we read when young. When we reread the book in our maturity, we then rediscover these constants which by now form part of our inner mechanisms though we have forgotten where they came from. There is a particular potency in the work which can be forgotten in itself but which leaves its seed behind in us.

Italo Calvino, Why Read the Classics?