Question
Spiritual significance of Goddess Lakshmi serving the Lotus feet of God Vishnu
Answer
Goddess Lakshmi (Sanskrit: लक्ष्मी} is the goddess of wealth, fortune and prosperity.
Goddess Lakshmi is the “eternal” consort and shakti (energy) of God Vishnu.
Goddess Lakshmi is also considered as, another aspect of the Supreme Goddess.
Goddess Lakshmi serving Vishnu's feet should not be taken literally.
And should only be perceived to understand the devotional aspect of life.
Goddess Lakshmi is always seen worshipping the Lotus feet of Lord Vishnu.
As mentioned in Srimad-Bhagavatam (1.11.33):
The goddess of fortune, although by nature very restless and moving, could not quit the Supreme’s feet.
Lord Brahma explains the significance of this form of devotion, in Srimad Bhagavatham 10.14.58
For those who have accepted the boat of the lotus feet of the Lord, who is the shelter of the cosmic manifestation and is famous as Murāri, the enemy of the Mura demon, the ocean of the material world is like the water contained in a calf’s hoof-print. Their goal is paraṁ padam, Vaikuṇṭha, the place where there are no material miseries, not the place where there is danger at every step.
Though Goddess Lakshmi is the Goddess of wealth and presides over all forms of prosperity, the goddess shows to the world that serving the Supreme is greater than all the treasures on earth.
Reference - Srimad Bhagavatham(Bhāgavata Purāṇa).
Reference link:-https://www.vedabase.com/en/sb?gclid=COTrlOjKl9ACFc6HaAodm0UHiA
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