Whatever form of the demigods a man desires to worship with faith, I make his faith strong in that particular form.
Bhagavad Gita - Chapter 7 - Jnana-Vijnana Yoga - The Yoga of Knowledge and Realization
One who worships that particular form with faith only attains the fulfillment of his desires due to My sanction alone.
However, the results achieved by such persons of little intelligence are temporary. Those who worship the demigods reach them, but My devotees attain Me.
My nature is eternal, supreme and imperishable. Yet less intelligent persons cannot comprehend this and consider Me to be the impersonal that has now accepted a material form.
I do not manifest Myself to everyone. I am hidden by My yogamaya potency and thus the foolish cannot recognize Me as eternal and unborn.
O Arjuna, I know past, present and future. I know all living beings, but they do not know Me.
O conqueror of the enemy, at the beginning of creation, all living beings are born bewildered by the dualities of desire and hatred.
Yet those that perform pious activities become purified of all reactions – they become free from the illusion of duality and worship Me with dedication.
te brahma tad viduh kritsnam adhyatmam karma cakhilam Those that strive to become free from old age and death by taking shelter of Me know the Absolute Truth, the individual self and the laws of action and reaction.
Those who know Me to be the Controller of matter, the Controller of the demigods and the recipient of all sacrifices – with their minds concentrated upon Me, they will know Me at the time of death.