Shri Ramadasa Charitam III Vol III Book VIII Chp 14 Shlokas 6 - 7
लिकिनाशाद्यथा शब्दो नैव नश्यति सर्वगः |
एवं नाशाच्छिलामूर्तेरीक्ष्वरो नैव नश्यति ||
अव्यक्तं तत्परं ब्रह्म व्यक्तरूपेण भावुकाः |
आरधयन्त्यालयेषु ददृढया भक्तिनिष्ठया ||
The sound is not destroyed just when the letters are destroyed. In the same way, God is indestructible even when the moorti is destroyed. The ardent bhaktas due to their staunch devotion worship that invisible Supreme Soul in the temples giving Him form.
