What is that thing in life that once you lost it you can never retrieve it back ??

A classic answer to that question is time.

Once a moment passes, you can’t get it back—no matter what you do. That’s why people often say time is the most valuable thing we have.

• Trust — once broken, it’s very hard to fully restore
• Youth — you can age well, but you can’t go back
• Opportunities — some chances only come once

But the most universal, undeniable one is still time.