He is a man, who is to be a man, the fruit is always present in the seed.

In this quote, Tertullian reflects on the idea that the essence of a person’s potential is already present from the very beginning, much like a seed contains the potential for a future fruit. "He is a man, who is to be a man, the fruit is always present in the seed" suggests that within every individual lies the inherent potential for their future growth and development. The quote emphasizes the idea that the fundamental qualities or destiny of a person are already embedded within them, even if they have yet to fully manifest.

Tertullian’s comparison of a person’s potential to a seed and its fruit underscores a natural progression from inherent possibility to tangible reality. Just as a seed contains the potential to grow into a specific type of fruit, a person’s true nature or calling is already present within them, waiting to be realized. The quote suggests that the foundation of one’s character or purpose is already laid at the start, and it is through time, experience, and effort that this potential is brought to fruition.

This concept also aligns with Tertullian's broader philosophical and theological views on human nature and divine purpose. As one of the early Christian apologists, Tertullian often focused on the relationship between humanity’s inherent nature and the potential for spiritual growth and transformation. The idea of the seed and fruit can be seen as a metaphor for the spiritual development of a person, where each individual has the capacity for moral and spiritual progress, which is cultivated through faith and action.

The origin of this quote is attributed to Tertullian, an influential early Christian writer and theologian from the 2nd and 3rd centuries. Known for his works on Christian doctrine, he often used vivid metaphors to explain complex theological ideas. This quote reflects Tertullian’s belief in the inherent potential within each person and the idea that, like a seed, an individual’s true nature will ultimately come to fruition through proper nurturing and growth.