Good is bitter, Bad is sweet.

 Bad things for the body are sweet and addictive, but healthy ones for the body are bitter and not addictive.
 Likewise, bad words and actions that deceive you and others are sweet and addictive, but good words and actions that enlighten you and others are bitter and not addictive.

Diligence frugality honesty etc.

 We should live diligently, frugally, and honestly and treat everything in life with doubt and confirmation. This is the way to keep ourselves well and not to ruin ourselves.
 Everyone can say this, but it is very difficult to implement.