Ideas improve. The meaning of words participates in the improvement. Plagiarism is necessary. Progress implies it. It embraces an author's phrase, makes use of his expressions, erases a false idea, and replaces it with the right idea.
“Childhood didn't have a big influence on me, really - in fact I spent most of it plotting how to escape.”
“Let us tenderly and kindly cherish, therefore, the means of knowledge. Let us dare to read, think, speak, and write.”