So take that stack of memories. When you're a toddler, you only know how to use it in one way: taking out one paper and looking indiscriminately at everything in that one picture.
You don't have words for everything you see: you mostly have only feelings and emotions associated with the picture.
Later on, you learn how to sift through and grab a bunch of those pictures and compare their common features. And that's when you start using words with abstract meanings: you learn what "truth" and "purple" mean; you start using those words to solve problems, also known as thinking logically. That's when, for better and for worse, you start to grow up.