Look before you leap.
Consider the consequences before committing to an irreversible action.
What They Mean
Inspect the landing area. Decisions that cannot be undone deserve more than enthusiasm.
Are They Right?
Generally. The cost of looking is a moment; the cost of leaping blind is occasionally the rest of one's afternoon.
What They Left Out
Prolonged looking is indistinguishable from not leaping.
They Also Say
Read the ruling: Look Before You Leap vs. He Who Hesitates Is Lost