Manava Dharmashastra 7.55

7.55

api yat sukaraṃ karma tad apy ekena duṣkaram
viśeṣato 'sahāyena kiṃ rājyaṃ mahodayam //

Even an undertaking easy (in itself) is (sometimes) hard to be accomplished by a single man; how much (harder is it for a king), especially (if he has) no assistant, (to govern) a kingdom which yields great revenues.