Values by Hofstede

"Values are among the first things children learn–not consciously, but implicitly [...] by the age of 10, most children have their basic value system firmly in place, and after that age, changes are difficult to make. Because they were acquired so early in our lives, many values remain unconscious to those who hold them. Therefore they cannot be discussed, nor can they be directly observed by outsiders. They can only be inferred from the way people act under various circumstances."