Be careful of what you said

"If your lips would keep from slips, five things observe with care; to whom you speak, of whom you speak, and how, and when, and where."
Quoted by W. E. NORRIS

Based on this quote, we should know that communication is inevitable, irreversible, and unrepeatable. Whatever we said, it cannot be changed. Sometimes, we might be joking with someone, but it might be a serious conversation to them even you do not mean it. Therefore, we must be careful of what we talk.