In this quote by Thomas Jefferson, he emphasizes the idea that sharing knowledge does not diminish one's own understanding or intellect. Instead, when someone learns from another, both parties benefit; the learner gains insight while the teacher's knowledge remains intact. This concept underlines the value of collaboration and the infinite nature of ideas.

Jefferson likens this exchange of ideas to lighting a candle from another's flame. When one candle shares its light, it does not lose its brightness but instead illuminates the surroundings further. This metaphor illustrates the power of knowledge transfer and how it can multiply rather than decrease individual understanding, highlighting the importance of teaching and mutual learning.