इन्द्रियाणां जये योगं समातिष्ठेद्दिवानिशम् ।
जितेन्द्रियो हि शक्नोति वशे स्थापयितुं प्रजाः ॥
indriyANAM jaye yogaM samAtiShThet divA nisham ।
jitendriyo hi shaknoti vashe sthApayituM prajAH ॥
- manu smRuti
A king must practice to keep his senses under control at all times - day and night. Only one who can win over his senses can rule over the subjects effectively.
- Manu Smriti