God is great

Many people claim, "God is great," but this is a hackneyed phrase. One must know how He is great, and that can be known from authorized scripture. In the Bhagavad-gita God describes Himself. He says, "My appearance of taking birth just like an ordinary human being is actually transcendental." God is so kind that He comes before us as an ordinary human being, but His body is not exactly like a human body. 

It is stated in Bhagavad-gita (9.11):"Fools deride Me when I descend in the human form. They do not know My transcendental nature and My supreme dominion over all that be." 

We have a chance to know about Krishna provided we read the right literature under the right direction, and if we simply know what the nature of God is, then by understanding this one fact alone we become liberated. It is not possible in our human condition to understand the Absolute Supreme Personality of Godhead completely, but with the help of Bhagavad-gita, the statements given by the Supreme Personality of Godhead, and of the spiritual master, we can know Him to the best of our capacity. If we can know Him in reality, then immediately after leaving this body we can enter into the kingdom of God. Krishna says, tyaktva deham punar janma naiti mam eti so 'rjuna: "After leaving this body, one who is in knowledge does not come again to this material world, for he enters into the spiritual world and comes to Me." (Bg. 4.9)

The purpose of our Krishna consciousness movement is to propagate this advanced scientific idea to people in general, and the process is very simple. Simply by chanting the holy names of God—Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare—one cleanses the dirt from his heart and gains understanding that he is part and parcel of the Supreme Lord and that it is his duty to serve Him. This process is very pleasant: we chant the Hare Krishna mantra, we dance rhythmically, and we eat nice prasada. While enjoying this life, we are preparing to enter into the kingdom of God in our next life. This is not a fabrication—it is all factual. Although to a layman this appears to be a fabrication, Krishna reveals Himself from within to one who is serious about God realization.

Ref: Easy Journey to other planets authored by Srila Prabhupada (Founder - Acharya, ISKCON)