He who hesitates is lost.
Delay in the face of opportunity is itself a decision, and frequently the losing one.
What They Mean
Opportunities are perishable. While you deliberate, someone else is already leaping, having looked only briefly.
Are They Right?
Often enough to be uncomfortable. Windows close. Queues form. The hesitant inherit whatever is left, which is usually nothing.
What They Left Out
The unhesitating are also lost with some regularity, simply sooner and with more confidence.
They Also Say
Read the ruling: Look Before You Leap vs. He Who Hesitates Is Lost