"Time spent on preparation is seldom wasted" underscores the importance of careful planning and groundwork before taking action. It suggests that investing effort in preparation often leads to better outcomes rather than rushing into things without adequate foresight.
This idea is echoed in Jeffrey Archer's book "Be Careful What You Wish For," where characters encounter the consequences of their decisions, emphasizing that thorough planning can be a key factor in achieving success and avoiding pitfalls.