The answer is: Salt

Luke 14:34-35

In this part of the Gospel of Luke, the imagery of salt is powerful and loaded with meaning. In Roman times, salt was more than just a seasoning; it was extraordinarily valuable, to the point where soldiers were sometimes paid in salt – hence the term “worth his salt.” Within its cultural context, Jesus’ remark about tasteless salt would have been particularly striking. When salt lost its flavor—meaning it was rendered useless—exactly like faith without works, it implies a loss of purpose.

Interestingly, Northern Africa exported much salt, and it was used to preserve fish and meat in ancient times. This preservation also symbolizes how Jesus’ teachings aim to 'preserve' lives in the moral sense; they offer guidance and meaning. If one loses sight of the transformative nature of these teachings, they become ineffective and flavourless, akin to that salt that can no longer do its job.

Just as tasters validate the quality of salt through taste, individuals are often called to reflect inwardly on their faith and actions. If one’s intention and passion for spreading kindness and understanding dissipate, their influence diminishes notably.

Here’s a fun fact: Did you know Romans were formulated paths and standard measurements, pirate-wise towards such tuneful methods of exchanges? It's almost art—pushing mundane forward into what matters. Jesus encourages us to stay engaged and vibrant—indeed seasoned!