As a Brahmana, without studying the Vedas, is unfit to officiate at a Shradha, so one who has not heard of the six means (for protecting a kingdom) is not fit to hear of the purposes (of a king).
अनधीत्य यथा वेदान् न विप्रः श्राद्धमर्हति। एवमश्रुतषाङ्गण्यो न मन्त्रं श्रोतुमर्हति॥