Natyashastra
तेषां कार्या गतिर्ये तु नैष्ठिकं व्रतमाश्रिताः । आलोलचक्षुश्च भवेद्युगमात्रनिरीक्षणः ॥ ८०॥
For those who have not taken a firm vow, their gait should be performed with wavering eyes and occasional glances (looking around intermittently).
english translation
teSAM kAryA gatirye tu naiSThikaM vratamAzritAH । AlolacakSuzca bhavedyugamAtranirIkSaNaH ॥ 80॥
hk transliteration by Sanscript