This is a popular expression used in English. It means that even though a person has not heard from another person for a long time, everything is probably OK. It is thought that this expression goes back to King James I of England, in approximately 1616.
沒有消息就是好消息。
此種說法據信可追朔到西元1616左右，英王詹姆士一世的年代。中文「好事不出門，壞事傳千里」的諺語，似乎為 No news is good news 做了明確的註解。