Answer:
The key ideas are;
1. Knowledge is acquired through observation and sensation.
2. Reflecting on past experiences can make us knowledgeable.
Step-by-step explanation:
The writer begins by imagining an instance when the mind is void with no ideas and knowledge. He explains that as individuals go through life they acquire experiences which would help them have a better understanding of matters. Observation of external sensible objects which could be found in the environment could provide materials of thinking. Examples are perceiving the scents of flowers, or touching a hot or cold object.
Materials of thinking could also be sourced from the internal operations of our mind. When we think about past experiences, we tend to ponder on when, why, and how things happen. These reflections supply us with knowledge.