以下是一些知足常樂的英文佳句：
1. "Be content, for content is the wealth of all."
2. "The best things in life are free, the best of these is content."
3. "Content is the ultimate wealth, and happiness comes from within."
4. "A content heart is the greatest wealth."
5. "The secret of happiness is to be happy with what you have."
6. "The key to happiness is to be grateful for what you have."
7. "The best way to predict the future is to appreciate what you have today."
8. "To be truly happy, always remember to be grateful and content."
9. "To live a happy life, one must be content with what one has."
10. "When you're content with what you have, you'll never be unhappy."
希望這些句子可以表達知足常樂的意義。