The correct phrase is key to success.
The phrase "key to success" is a common idiom, meaning a vital element or factor that leads to achieving a desired outcome. It's used to describe something that is essential for reaching a goal. The provided reference specifically states, "Hard work is 'key to success' is the correct one." This reinforces the idea that the correct usage is with "to."
Here's a table illustrating the correct and incorrect usages:
| Phrase | Correct/Incorrect |
|---|---|
| key to success | Correct |
| key for success | Incorrect |
Examples:
- Hard work is key to success.
- Good planning is key to success in any project.
- Communication is key to success in relationships.
The phrase "key for success" is not a standard idiom and sounds grammatically incorrect. The preposition "to" indicates a direction or connection, while "for" indicates a purpose or reason. In this case, "to" correctly links "key" as the path leading to success, rather than an aid aimed "for" success. The reference also clearly points out that 'key to success' is correct and is a well known proverb.
