Dr. Montessori believed that no human being is educated by another person; he must do it himself or it will never be done. She, therefore, felt that the goal of the educational process should not be to fill the child with facts, but rather to cultivate his own natural desire to learn. Children between the ages of two and six can pick up knowledge and understanding effortlessly, spontaneously, and joyfully. Dr. Montessori called the child’s mind at this stage “absorbent” and compared its soaking in knowledge to a sponge’s soaking in water. She also discovered that during these years there are sensitive periods when a child shows unusual ability to acquire particular skills and it is actually easier for him to learn those skills than at any other time in his life.