Final answer:
David Hume argues that cause and effect reasoning is weak, leading to uncertainty in our knowledge of matters of fact.
Step-by-step explanation:
David Hume, a Scottish philosopher, argued that there is a weakness in cause and effect reasoning. He believed that our knowledge of matters of fact, such as the sun rising tomorrow, is based on induction and therefore uncertain. Hume claimed that cause and effect reasoning relies on the assumption that the future will be like the past, but this assumption cannot be proven.