Lao Tzu was a philosopher of ancient China, best known as the author of the Tao Te Ching. His association with the Tào Té Chīng has led him to be traditionally considered the founder of philosophical Taoism (pronounced as "Daoism"). He is also revered as a deity in most religious forms of Taoist philosophy, which often refers to Laozi as Taishang Laojun, or "One of the Three Pure Ones".
Trust is one of the biggest things needed in all kinds of relationships. Friendships, boy/girl friend, parents, siblings etc. all need trust and emotional security. Without giving someone your trust it will be very difficult for you to open up to that person. Therefore the relationship would not go very far. Although trust is extremely difficult to give and it is hard to put yourself in a vulnerable position, if that person is someone you want to have a lasting friendship or relationship with