Mbh 15.5.1b

Thou shouldst always keep thy senses, as thou keepest thy horses. They will then prove beneficial to thee, like wealth that is not wasted. Thou shouldst employ only such ministers as have passed the tests of honesty, (i.e., as are possessed of loyalty, disinterestedness, continence, and courage), as are hereditary officers of state, possessed of pure conduct, self-restrained, clever in the discharge of business, and endued with righteous conduct. Thou shouldst always collect information through spies in diverse disguises, whose faithfulness have been tested, who are natives of thy kingdom, and who should not be known to thy foes. Thy citadel should be properly protected with strong walls and arched gates. On every side the walls, with watch-towers on them standing close to one another, should be such as to admit of six persons walking side by side on their top.[8] The gates should all be large and sufficiently strong. Kept in proper places those gates should be carefully guarded. Let thy purposes be accomplished through men whose families and conduct are well known. Thou shouldst always protect thy person also with care, in matters connected with thy food, O Bharata, as also in the hours of sport and eating and in matters connected with the garlands thou wearest and the beds thou liest upon. The ladies of thy household should be properly protected, looked over by aged and trusted servitors, of good behaviour, well-born, and possessed of learning, O Yudhishthira. Thou shouldst make ministers of Brahmanas possessed of learning, endued with humility, well-born, conversant with religion and wealth, and adorned with simplicity of behaviour. Thou shouldst hold consultations with them. Thou shouldst not, however, admit many persons into thy consultations. On particular occasions thou mayst consult with the whole of thy council or with a portion of it. Entering a chamber or spot that is well protected (from intruders) thou shouldst hold thy consultation.