In Numerology, each single-digit number is seen as having its own unique personality; a range of attributes that is well defined and specific to that number. While there are certain character traits that are shared by multiple numbers, each number's complete personality is entirely unique and easy to recognize.
For example, while the 6 and the 9 are both compassionate and self-sacrificing -- sharing some very humane and caring qualities -- they express those attributes in very different ways. The 6 is family- and community-oriented and its care and compassion is directed at people within the immediate circle of friends, family and neighbors. The 9, however, has a more global perspective and directs its sympathy and self-sacrificing potential toward people at large, without the need to know them personally. In fact, the 9 tends to be a bit aloof, if not distant, toward people close by, while the number 6 does not easily relate to people it doesn't know personally. Hence, when you see someone helping at the local food kitchen, that would be more in line with a 6, while the person involved in raising money to combat poverty in a country far away behaves more like a 9.
Perhaps the most challenging aspect when learning Numerology is to recognize and understand the attitude and actions of a number within a particular environment or location of the chart, because just as human beings act different depending on the situation, so do numbers. In fact, a number may express itself in a positive way when found in one location of a Numerology chart, and in a negative way when located elsewhere in the chart.
When someone starts to read books and look into other resources in an effort to learn the language of numbers, there is a tendency to simply become familiar with the attributes of numbers as they are usually listed. However, this objective, clinical approach that lists a bunch of traits as a way to define a number just does not take into account the subtle differences and flexible nature of even the most rigid features.