Final answer:
The line in question alludes to 'knowledge by acquaintance,' which is knowledge gained through direct experience, as opposed to propositional knowledge, which is fact-based. Philosophers like Bertrand Russell have emphasized the difference between these types, while philosophical skill involves navigating the broader world of concepts.
Step-by-step explanation:
The line in question seems to discuss the notion of knowledge by acquaintance, which is a direct experience without inference. Unlike propositional knowledge, which is about facts that can be right or wrong, knowledge by acquaintance stems from direct awareness of something through personal experience. For instance, when one experiences pain, they know this pain directly, not through any logical deduction or reasoning (a posteriori knowledge). Philosophers like Bertrand Russell have emphasized the importance of understanding different types of knowledge. In contrast, systemic ways of knowing, like mathematics or geometry, rely on understanding a system of words or symbols and the rules that govern them. What elevates the philosophical skill set is the ability to navigate the world of concepts, which encompasses not only propositional knowledge but also a comprehensive understanding of how various types of knowledge and their methodologies fit together.