In this quote from "Justine" by Lawrence Durrell, the character reflects on a person's internal struggles and the effort they put into thinking and suffering. Despite experiencing a lot internally, they are hindered by a lack of courage, which is essential for taking action as a practitioner in their field or life. This suggests that understanding and emotional suffering alone are not enough to succeed without the necessary bravery.

The quote emphasizes the importance of resolution and daring to face challenges head-on. It highlights that without the courage to act and confront hardships, even the most thoughtful and suffering individuals may fall short of their potential or goals, underlining that bravery is a crucial trait for success in any endeavor.