Summary
This quote suggests the progression of important traits as one ages. At 20, a person's willpower and determination are dominant forces, driving their actions and decision-making. By the time they reach 30, their wit and cleverness become more prominent, leading them to make smarter and more cunning choices. Finally, at the age of 40, their judgement becomes the most influential factor, indicating that they have gained wisdom and experience that guides their decision-making process. Overall, the quote emphasizes the development and evolution of essential qualities as a person grows older.