In A.S. Byatt's book "Possession," the author presents a rich exploration of scholarly pursuits and the sometimes perilous nature of obsession. The quote "All scholars are a bit mad" reflects the idea that those who dedicate themselves to their fields often do so with an intensity that can border on madness. This suggests that deep intellectual engagement can lead to irrational behavior or a detachment from reality, as scholars become consumed by their quests for knowledge and truth.

The second part of the quote, "All obsessions are dangerous," highlights the inherent risks in becoming fixated on an idea or pursuit. While passion can drive innovation and discovery, it can also lead to negative consequences, both personally and professionally. Byatt’s work emphasizes the delicate balance between the pursuit of knowledge and the potential pitfalls of letting that pursuit overshadow other aspects of life, urging a contemplation of the costs of scholarly passion.