Vivekachudamani 350

अयोऽग्नियोगादिव सत्समन्वयान् 

मात्रादिरूपेण विजृम्भते धीः । 

तत्कार्यमेतद्द्वितयं यतो मृषा 

दृष्टं भ्रमस्वप्नमनोरथेषु ॥ ३५0 ॥ 

ayo'gniyogādiva satsamanvayān 

mātrādirūpeṇa vijṛmbhate dhīḥ | 

tatkāryametaddvitayaṃ yato mṛṣā 

dṛṣṭaṃ bhramasvapnamanoratheṣu || 

(Sankaracarya's Vivekachudamani 350) 

Just as a piece of iron through contact with fire manifests as fire, the intellect manifests itself as the knower and the known through the immanence of Brahman. These two-the effects of the intellect-are observed to be unreal as in delusion, dream, and imagination. 

Just like if you touch a metal rod to the fire, it becomes warm, and then it acquires the quality of the fire. The metal rod, you can touch anywhere, it will burn, although it is a metal rod. But because it acquired the quality of the fire, it can burn, it can act as fire. Similarly, if we constantly associate with Lord Vasudeva or Brahman, then we acquire spiritual quality. Then we can act as spiritual very quick. This is the point. 

So the heat of the material world and the real heat of the Lord. is different. The heat in this world is unreal and the heat of the Lord is real.