One must always be careful of books and what is inside them, for words have the power to change us.
Words are what we are made of. Words from the bedtime stories we heard when we were little. Words of our teachers teaching us all sorts of things about the big wild world. Words of encouragements. Words of kindness. Even words which were not so good and gave us some of the deepest wounds.
We should be very careful with the words we let in our lives for they do have the power to change us for good or bad.