Here below, the brahmanas carefully study all the Vedas, and because they assimilate their conclusions, they are considered to represent the Vedas personified. They are established in sattva-guna, the supreme spiritual attribute. As such, they possess control over the mind and the senses, as well as truthfulness. They explain the Vedas according to their original meaning and, out of pure compassion, teach their ultimate objective to all conditioned souls. They practice austerity and tolerance, and are aware of the respective positions of the infinitesimal being (the infinitesimal soul, what each of us really is) and the Supreme Lord. These are the eight qualities of the brahmanas.
Thus, of all living beings, none is superior to the brahmanas (the learned sages).
I am infinitely great and all-powerful, superior to Brahma and Indra, the king of the heavenly planets.
I am also the bestower of the happiness enjoyed in the heavenly realm or that which liberation brings.
Yet, the brahmanas do not seek any material well-being from me. They are of great purity and desire nothing. They are content to serve me with devotion.
What need, then, would they have to ask for material blessings from anyone else?
My dear sons, you should not envy any living being, moving or immobile. Knowing that I am within each of them, you should show respect to all at all times.
In doing so, it is to me that you will be making an offering of respect.
The true activity of the sense organs, whether the mind, the eye, the tongue, or any other organ of perception or action, is to serve Me fully. Unless the senses are used in this way, the conditioned soul cannot even think of escaping the terrible spiral of material existence, which is as powerful as the rigid rope of Yamaraja (the lord of death and judge of the guilty, appointed by Lord Krishna, the Supreme Personality of Godhead).
The Supreme Lord, Krishna, teaches us the science of God, or devotional science, which is nothing other than the manifestation of love for His Divine Personality.
Krishna, the Supreme Personality of Godhead, tells us: “Only through devotional service, and thus alone, can one know Me as I am. And the being who, through such devotion, becomes fully aware of Me, can then enter My absolute kingdom.
Only by serving Me with undivided love and devotion can one know Me as I am, standing before you, and likewise, truly see Me. Thus, and only thus, can the mystery of My Person be pierced.
When purely spiritual experience is stimulated by cognition and service [loving and devoted service to the Supreme Lord, characterized by the commitment, once the senses have been purified, to serve the senses of God], then the supreme and unalloyed devotion, marked by love for God, is awakened toward Krishna, the beloved of all souls.
The highest devotion is gradually attained through constant striving for self-realization, with the aid of scriptural evidence, theistic conduct, and perseverance in practice.
These preliminary devotional practices lead to the realization of loving devotion. No well-being surpasses such devotion, which accompanies access to the exclusive state of supreme bliss, which leads to Me.
Abandoning all meritorious works, serve Me with faith. Realization will correspond to the nature of each one's faith. The citizens of the world are constantly working towards some ideal. By meditating on Me through one's actions, one will acquire devotion marked by love in the form of supreme service.
I am the seed, that is, the fundamental principle of this world of mobile and immobile entities. I am the substance of matter, the material cause and the efficient cause.”
Devotional service offered to Krishna, the Supreme Personality of Godhead, is a manifestation of the love one feels for the Supreme Lord, and an expression of the feelings one feels for Him, through which we take pleasure in fully satisfying Him, hence its importance.
To learn much more about devotional service, open the book “Chaitanya, the Golden Avatar” and click on the chapters “What does this service consist of and what are its manifestations?” or on page 12
And “Devotional service is the manifestation of love for God, and the expression of feelings for Krishna”, or on page 13
You can also open the book “The Pure Spiritual Science” and click on the chapter “Features of Pure Devotional Service”, or on page 69