The answer is: Tree of knowledge of good and evil

Gen 2:17

When we consider the story from Genesis, it’s fascinating to note the choice presented to Adam regarding the Tree of Knowledge of Good and Evil. This tree symbolizes a fundamental aspect of human experience: the ability to choose between different paths of understanding and existence.

The instruction to refrain from eating its fruit might seem stern but can be viewed more as an invitation to explore the notion of free will. Here is where it gets interesting—the concept of knowledge itself. In various interpretations, this tree doesn’t just represent a prohibition; it signifies the moment humans could differentiate between good and evil.

To add a layer of depth, Jewish mystical thought, particularly Kabbalah, views this tree and the resulting ‘fall’ as a part of the journey towards enlightenment and self-understanding. These themes resonate throughout the biblical narrative, pointing even into the New Testament, where knowledge and wisdom are prized, and the call for discernment echoes back to the creation account.

Moreover, consider the intriguing fact that trees often carry significant symbolism in the Bible. For instance, the Olive tree represents peace, and the Cedars of Lebanon enable us to reflect on strength and stability. But right from the early pages of Genesis, the Tree of Knowledge shifts everything by showing not just a boundary set by God but also the personal responsibility that comes with that boundary.

This tale subtly invites us into reflecting on the choices we make in our pursuit of knowledge today! It's a daily reminder that every decision has layers of wisdom waiting to be unveiled.