When Adam and Eve bit into the apples sin entered, and knowledge of light and dark entered into them stamping human kind. With this knowledge their eyes had opened up and they knew they were naked. Knowing that they were naked (acting upon the newly acquired knowledge) they constructed clothes from themselves out of fig leaves. This all being said we possibly could not have evolved intellectually without knowledge.
Knowledge can be used for good and bad intentions. this good and bad equates to the knowledge of light and dark.