海倫·凱勒的知名名言如下：
1. "Be faithful, kind, true. Don't try to outshine your neighbors or worry what they will think of you. Trust yourself; give to others and you will live your best life."
2. "Never, never, never give up."
3. "Education is the most powerful weapon which you can use to change the world."
希望以上名言符合您的要求。