People
True friendship is like sound health; the value of it is seldom known until it be lost.
— Charles Caleb Colton

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker compares real friendship to good health, noting that both are easy to take for granted while they last and are only truly appreciated once they're gone. It's a reflective observation about how people often overlook what matters most until it slips away.
Context reviewed