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Krṣṇa, the Supreme Personality of Godhead
humanitarianism, nationalism, and whatever else may be manufactured for the peace and prosperity of the world, are all useless and frustrating because of our gross ignorance of the art of loving Krṣṇa. Generally people think that by advancing the cause of moral principles and religious rites, they will be happy. Others may think that happiness can be achieved by economic development, and yet others think that simply by sense gratification they will be happy. But the real fact is that people can only be happy by loving Krṣṇa.
Krṣṇa can perfectly reciprocate one's loving propensities in different relationships called mellows or  rasas . Basically there are twelve loving relationships. One can love Krṣṇa as the supreme unknown, as the supreme master, the supreme friend, the supreme child, the supreme lover. These are the five basic love  rasas . One can also love Krṣṇa indirectly in seven different relationships, which are apparently different from the five primary relationships. All in all, however, if one simply reposes his dormant loving propensity in Krṣṇa, then his life becomes successful. This is not a fiction but is a fact that can be realized by practical application. One can directly perceive the effects that love for Krṣṇa has on his life.
In the Ninth Chapter of the  Bhagavad-gītā  this science of Krṣṇa consciousness is called the king of all knowledge, the king of all confidential things, and the supreme science of transcendental realization. Yet we can directly experience the results of this science of Krṣṇa consciousness because it is very easy to practice and is very pleasurable. Whatever percentage of Krṣṇa consciousness we can perform will become an eternal asset to our life, for it is imperishable in all circumstances. It has now been actually proved that today's confused and frustrated younger generation in the Western countries can directly perceive the results of chanelling the loving propensity toward Krṣṇa alone.
It is said that although one executes severe austerities, penances and sacrifices in his life, if he fails to awaken his dormant love for Krṣṇa, then all his penances are to be considered useless. On the other hand, if one has awakened his dormant love for Krṣṇa, then what is the use in executing austerities and penances unnecessarily?
The Krṣṇa consciousness movement is the unique gift of Lord Caitanya to the fallen souls of this age. It is a very simple method which has actually been carried out during the last four years in the Western countries, and there is no doubt that this movement can satisfy the dormant loving propensities of humanity. This book  Krṣṇa  is another presentation to help the Krṣṇa consciousness movement in the Western world. This transcendental literature is published in two parts with profuse illustrations.