God is one but the names are many, forms are many. Shiva-Shakti, both are one. Ardhanarishwara is one; half woman and half man, Hari hara is not two it is just one; half is Hara and the other half is Hari. Everything is one and there is only one God 'Bhagavanta'
~ Sri Sri Ravi Shankar
Sri Sri Ravi Shankar explains the importance of Navratri pooja in Hindi
या देवी सर्वभूतेषु मातृरूपेण संस्थिता
नमस्तस्यै नमस्तस्यै नमस्तस्यै नमो नमः
This bhajan is a thanksgiving song, celebrating the abundance which has descended on the singer's life, showered by Devi Ma's blessings.
Ya Devi sarva bhuteshu maatru rupen sansthitha, namastasye, namastasye, namastasye namo namah.
~ excerpt from Durga Saptashati, Markandey Purana, Tantroktam Devi Suktam
Meaning:
The Divine Mother who dwells in all living beings in the form of mother, We bow down to that Mother again and again and again.