What is the origin of the idiom "now or never" and when to use it?

The idiom "now or never" dates back to the 16th century and has its origins in the English language. It is a combination of the adverb "now," indicating the present time, and the adverb "never," denoting the absence of any future opportunity. The phrase is commonly used in personal goals, such as pursuing dreams, making life-changing choices, or expressing feelings to someone.