स्वभाव एष वस्तूनां स्वतःसिद्धिर्हि नान्यतः ।नियतिं न जहात्येव शशाङ्क इव शीतताम्
In plain words
This is the very nature of things: their accomplishment arises of itself, from nowhere else; it never departs from niyati, just as the moon never departs from its coolness.