“As to diseases, make a habit of two things — to help, or at least, to do no harm.”
“If you can, help others; if you cannot do that, at least do not harm them.”
“H is for Habit, winners make a habit of doing the things losers don't want to do.”
“If you can do no good, at least do no harm.”
“Good" is what helps us or at least does not hinder. "Evil" is whatever harms us or interferes with us, according to our own selfish standards.”