Verse 31

सर्वदैवाविनाशात्म कुम्भानां गगनं यथा ।यथा मणेरयःस्पन्दे अयस्कान्तस्य कर्तृता

In plain words

It is forever of imperishable nature, as the space is of jars; as, in the stirring of iron, the agency belongs to the gem, the lodestone.