People spend most of their lives at work. It is the primary way that they serve the needs of others in society. They deserve and need to have strong feelings about what they do. Sun Tzu wants you inspire emotions in people whenever you find the opportunity. A workplace where people simply do their jobs without any feeling or emotional connection is a dead organization.
Dead organizations are never successful.
People want and deserve to feel alive. This is what we mean when we say that management is primarily the job of inspiration. People need and deserve to be challenge. They need and deserve to be surprised with unexpected rewards. If you want to be successful, you must constantly work to keep your people interested and excited to come to work every morning.