Never __________ something you don't _______________.

The principle behind the statement "Never __________ something you don't _______________" stresses the importance of knowledge and understanding in financial decisions. The correct completion of the phrase emphasizes that individuals should only invest in things they fully comprehend. This is crucial because a lack of understanding can lead to poor investment choices, increased risk, and potential financial loss.

Investing requires a thorough grasp of the asset, its market, potential risks, and returns. If an investor does not understand what they are investing in, they are more likely to make hasty or uninformed decisions that could endanger their financial stability. By prioritizing understanding before making investment decisions, individuals can make informed choices that align with their financial goals and reduce their risk exposure.

In contrast, the other options fail to capture this critical emphasis on knowledge before investing. Therefore, the focus remains on understanding as the foundation for sound investment practices.