What does gem mean in the preface by Edward Taylor?

In the preface to his book "Preparatory Meditations," Edward Taylor uses the term "gem" in a metaphorical sense to refer to the religious teachings and divine truths contained within the book. He likens these teachings to precious stones or jewels, emphasizing their value, rarity, and spiritual significance.

Taylor elaborates on this metaphor by describing the book as "a cabinet of rich gems," "sparkling diamonds," and "inestimable pearls." These metaphors convey the idea that the book contains profound and spiritually enlightening content that is worth cherishing and contemplating.

He further explains that the book is not meant to be a comprehensive theological treatise, but rather a collection of brief and concise meditations designed to inspire readers and deepen their understanding of spiritual matters. By comparing these meditations to gems, Taylor suggests that they are like polished and refined fragments of wisdom, each offering a glimpse into the depths of divine truth.

Overall, Taylor's use of the term "gem" in the preface emphasizes the value and significance of the religious teachings presented in the book, encouraging readers to explore and appreciate the spiritual insights it contains.