The following are as defined by the AJKF (All Japan Kendo Federation):
THE CONCEPT OF KENDO
The concept of Kendo is to discipline the human character through the application
of the principles of the Katana (sword).
THE PURPOSE OF PRACTICING KENDO
The purpose of practicing Kendo is: To mold the mind and body,
To cultivate a vigorous spirit, And through correct and rigid training,
To strive for improvement in the art of Kendo. To hold in esteem human courtesy and honor,
To associate with others with sincerity, And to forever pursue the cultivation of oneself.
This will make one be able: To love his/her country and society, To contribute to the development of culture
And to promote peace and prosperity among all peoples.
Much of what we could tell you already exists on the internet, so rather than re-invent the wheel,
here are some links to other sites which already say it well.