Bhava, birth, should be understood to refer to the body. As far as the soul is concerned, there is neither birth nor death; that we have discussed in the beginning of Bhagavad-gita. Birth and death apply to one's embodiment in the material world. Fear is due to worrying about the future. A person in Krishna consciousness has no fear because by his activities he is sure to go back to the spiritual sky, back home, back to Godhead. Therefore his future is very bright. Others, however, do not know what their future holds; they have no knowledge of what the next life holds. So they are therefore in constant anxiety. If we want to get free from anxiety, then the best course is to understand Krishna and be situated always in Krishna consciousness. In that way we will be free from all fear.

Bhava, birth, should be understood to refer to the body. As far as the soul is concerned, there is neither birth nor death; that we have discussed in the beginning of Bhagavad-gita. Birth and death apply to one's embodiment in the material world.

In the Srimad-Bhagavatam it is stated that fear is caused by our absorption in the illusory energy, but those who are free from the illusory energy, those who are confident that they are not the material body, that they are spiritual parts of the Supreme Personality of Godhead and are therefore engaged in the transcendental service of the Supreme Godhead, have nothing to fear. Their future is very bright. This fear is a condition of persons who are not in Krishna consciousness. Bhayam, fearlessness, is only possible for one in Krishna consciousness.

An excerpt from the Bhagavad-gita As It Is, purport to 10.4-5.