Vygotsky thought that child development during the first two years have to do with direct connection with the world. After the two years language changes the way a child thinks. Language is important because it is how adults pass on ideas to children. Vygotsky felt that growth of language leads to a huge change in how children think because they can communicate ideas with others. Children talk to both others and themselves. Vygotsky thought that children talking to themselves was very important for development. He thought that children talk to themselves to help guide their thoughts. He called talk directed at the self, private speech. Private speech is used when a job is hard, after an error is made, or when the child is unsure of what to do. Children that use private speech are more attentive and involved in the job they are doing. Also children who have trouble learning use private speech more. This is to help them understand what they are learning.