Sankaracarya's Vivekachudamani 407

मायामात्रमिदं द्वैतमद्वैतं परमार्थतः ।

इति ब्रूते श्रुतिः साक्षात्सुषुप्तावनुभूयते ॥

māyāmātramidaṃ dvaitamadvaitaṃ paramārthataḥ |

iti brūte śrutiḥ sākṣātsuṣuptāvanubhūyate ||

(Sankaracarya's Vivekachudamani 407)

The scripture itself declares that all duality is a mere illusion (maya), Non-duality alone is the Absolute Truth. Such is also our direct experience in deep-sleep.

There cannot be more than one God, if there are more Gods, it is simply an illusion. There should be only one God. That one and only God is the absolute truth and Supreme Personality. Let us meditate upon the Supreme Lord Sri Narayana.