This quote from Nicholas A. Basbanes' "A Gentle Madness" emphasizes that a genuine love for books is not just a casual interest but a profound aspect of one's identity. The terms "thought," "patience," and "discrimination" suggest that developing a passion for reading requires careful consideration and discernment, reflecting one's values and character.

Moreover, the notion of book passion as a signature of character indicates that the books we choose and the way we engage with literature reveal much about who we are. This highlights the importance of cultivating a meaningful literary life, where one's interactions with books shape personal growth and define one's character in a significant way.