All buildings have a purpose. It could be to learn, to sell goods or services, to reflect or meditate, and so on. Occasionally buildings are repurposed, but as a rule their purpose is fixed. A shop is always a shop. It has the purpose of selling items of value to customers who are willing to pay for that value and to make a profit for the owners.
The purpose of a building is further refined by the owner. A shop owned by a clothing retailer sells clothes and accessories, a shop owned by a beverage company may be to sell tea and coffee.
If you were to go into your local clothes shop and be presented by a display of fine green teas between the t-shirts and jeans you would find this incongruous. Yet this is what happens to a greater or lesser extent when people find us acting in one way with one group of people and very differently with another. This incongruity often also causes us personal stress.
Think about how your way of being, your behaviours, the values you demonstrate, changes according to the different contexts you find yourself in in your life, perhaps when you are operating in different roles, with different individuals or groups of people, or when undertaking different activities. How does that make you see yourself? Now consider what someone watching these different ways of being would see you.
Having an overriding purpose or mission makes it easier for us to behave consistently whatever the context. In so doing we portray a consistent identity and authenticity to others, helping us to develop trust and rapport. We also reduce the stress in our lives by reducing our own internal inconsistencies.