I tell my students you have an absolute right to write about people you know and love. You do. But the kicker is you have a responsibility to make the characters large enough that you will not have sinned against them.
“Property is not the sacred right. When a rich man becomes poor it is a misfortune, it is not a moral evil. When a poor man becomes destitute, it is a moral evil, teeming with consequences and injurious to society and morality.”
“I hesitate to predict whether this theory is true. But if the general opinion of Mankind is optimistic then we're in for a period of extreme popularity for science fiction.”