Four things come not back: the spoken word, the sped arrow, the past life and the neglected opportunity.

Similar sayings:

Swiftest horse cannot overtake the word once spoken Swiftest horse cannot overtake the word once spoken
If what we see is doubtful, how can we believe what is spoken behind the back If what we see is doubtful, how can we believe what is spoken behind the back
Do not anxiously hope for that which is not yet come; do not vainly regret what is already past Do not anxiously hope for that which is not yet come; do not vainly regret what is already past
Married couples tell each other a thousand things without speech Married couples tell each other a thousand things without speech
A crisis is an opportunity riding the dangerous wind A crisis is an opportunity riding the dangerous wind

Chinese sayings and proverbs