Weirwoods are considered sacred. The children of the forest believe weirwoods are gods. The greenseers of the children of the forest can see through the eyes of weirwoods with carved faces. Since trees have no sense of time, the greenseer can see into the past or present when looking through the eyes of a tree. It said that through the faces the gods they watch over the followers and bear witness to important events. Weirwoods are used to bear witness to important ceremonies such as marriages. It said that it is impossible to lie in the presence of a heart tree.