Fear is due to worrying about the future. BG 1972 purports

Expressions researched:
"Fear is due to worrying about the future"

Bhagavad-gita As It Is

BG Chapters 7 - 12

Fear is due to worrying about the future. A person in Kṛṣṇa 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.

BG 10.4-5, Purport: Birth and death apply to one's embodiment in the material world. Fear is due to worrying about the future. A person in Kṛṣṇa 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 Kṛṣṇa and be situated always in Kṛṣṇa consciousness. In that way we will be free from all fear. In the Śrīmad-Bhāgavatam (11.2.37) it is stated, bhayaṁ dvitīyābhiniveśataḥ syāt: 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 who 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 Kṛṣṇa consciousness. Abhayam, fearlessness, is possible only for one in Kṛṣṇa consciousness.