निस्सर्पे बद्धसर्पे वा वस्तुं हि भवने सुखं ।
दृष्टनष्टभुजंगे तु निद्रा दुःखेन गम्यते ॥
nissarpe baddha sarpe vA vastuM hi bhavane sukham ।
dRuShTa naShTa bhujange tu nidrA duHkhena gamyate ॥
It is easy to live in a house where there is no snake or the snake has been captured. But is is very difficult to sleep peacefully when you have seen a snake and it is has disappeared later.