Final answer:
C.S. Lewis believes natural loves are not self-sufficient as they can lead to negativity and need divine Love for balance. He identifies potential issues with Affection, Friendship, and Eros, which can be remedied through the selfless qualities of Charity.
Step-by-step explanation:
C.S. Lewis argues that natural loves are not self-sufficient because they can often lead to imbalances and even tyranny if left unchecked. In his view, natural loves must be augmented and supplemented by divine Love (Charity) to reach their full potential and avoid inherent flaws. For Affection, Lewis asserts that it can become possessive and discriminating.
Friendship, while noble, can exclude others and create an inner circle that is impermeable to outsiders. Eros, or romantic love, can become an all-consuming passion that neglects other duties and responsibilities. As a remedy, Lewis suggests that all natural loves need to be transformed by Charity, which is selfless love that cares for the well-being of the other, without personal gain, ultimately hinting at a divine source of love.