This quote is referring to the importance of understanding and adapting to the specific conditions and needs of an army, rather than simply applying the same tactics and strategies used in civilian governance. Sun Tzu believed that failing to understand and address the unique challenges of an army, such as the need for discipline and cohesion, can lead to restlessness and discontent among the soldiers, which can undermine the effectiveness of the army as a whole.
By attempting to run a company in the same way as he manages his family, without understanding the unique conditions of the business environment, this creates unrest among the employees.
Being a leader in a business requires a different approach than leading a family. A business leader must be strong and confident in order to effectively make decisions and guide the company towards success. They must be able to adapt to the unique challenges and demands of the business environment, while also inspiring and motivating their team to achieve their goals. In contrast, a family leader may prioritize creating a nurturing and supportive environment, and focus on building strong, positive relationships within the family unit. While both roles require strong leadership skills, the specific approaches and priorities may vary depending on the context.