This quote is a clever play on words, and its meaning can be interpreted in two ways:
If you have to ask, you'll never know: This interpretation suggests that some knowledge or understanding can only be acquired through personal experience or direct involvement. Some things in life cannot be fully grasped or appreciated by simply asking about them; one must experience or live through them to truly understand.
If you know, you need only ask: This interpretation suggests that if you possess knowledge or understanding about something, you don't need to seek validation or confirmation from others. Instead, you can confidently inquire or seek further information to expand your understanding or clarify any doubts you may have.
Overall, the quote implies the importance of firsthand experience and knowledge while also emphasizing the value of curiosity and willingness to seek information when needed. It encourages continuous learning and exploration to deepen one's understanding of the world.