In the psychological realm of relationship between teacher and child, the teacher's part and its techniques are analogous to those of the valet; they are to serve, and to serve well: to serve the spirit.
Maria MontessoriThis system in which a child is constantly moving objects with his hands and actively exercising his senses, also takes into account a child's special aptitude for mathematics. When they leave the material, the children very easily reach the point where they wish to write out the operation. They can thus carryout an abstract mental operation and acquire a kind of natural and spontaneous inclination for mental calculations.
Maria Montessori