A. A lack of faith & trust in God & His Word:

MAT 8:26. And he saith unto them, Why are ye fearful, O ye of little faith? Then he arose, and rebuked the winds and the sea; and there was a great calm.

MAR 4:40. And he said unto them, Why are ye so fearful? how is it that ye have no faith?

ISA 51:12. I, even I, am he that comforteth you: who art thou, that thou shouldest be afraid of a man that shall die, and of the son of man which shall be made as grass;

ISA 51:13. And forgettest the LORD thy maker, that hath stretched forth the heavens, and laid the foundations of the earth; and hast feared continually every day because of the fury of the oppressor, as if he were ready to destroy? and where is the fury of the oppressor?

B. Looking at circumstances & conditions:

JOS 17:14. And the children of Joseph spake unto Joshua, saying, Why hast thou given me but one lot and one portion to inherit, seeing I am a great people, forasmuch as the LORD hath blessed me hitherto?

JOS 17:15. And Joshua answered them, If thou be a great people, then get thee up to the wood country, and cut down for thyself there in the land of the Perizzites and of the giants, if mount Ephraim be too narrow for thee.

JOS 17:16. And the children of Joseph said, The hill is not enough for us: and all the Canaanites that dwell in the land of the valley have chariots of iron, both they who are of Bethshean and her towns, and they who are of the valley of Jezreel.

JOS 17:17. And Joshua spake unto the house of Joseph, even to Ephraim and to Manasseh, saying, Thou art a great people, and hast great power: thou shalt not have one lot only:

JOS 17:18. But the mountain shall be thine; for it is a wood, and thou shalt cut it down: and the outgoings of it shall be thine: for thou shalt drive out the Canaanites, though they have iron chariots, and though they be strong.

PSA 107:23. They that go down to the sea in ships, that do business in great waters;

PSA 107:24. These see the works of the LORD, and his wonders in the deep.

PSA 107:25. For he commandeth, and raiseth the stormy wind, which lifteth up the waves thereof.

PSA 107:26. They mount up to the heaven, they go down again to the depths: their soul is melted because of trouble.

PSA 107:27. They reel to and fro, and stagger like a drunken man, and are at their wit's end.

MAT 14:30. But when he saw the wind boisterous, he was afraid; and beginning to sink, he cried, saying, Lord, save me.

MAR 4:37. And there arose a great storm of wind, and the waves beat into the ship, so that it was now full.

MAR 4:38. And he was in the hinder part of the ship, asleep on a pillow: and they awake him, and say unto him, Master, carest thou not that we perish?

MAR 4:39. And he arose, and rebuked the wind, and said unto the sea, Peace, be still. And the wind ceased, and there was a great calm.

MAR 4:40. And he said unto them, Why are ye so fearful? how is it that ye have no faith?

2CO 7:5. For, when we were come into Macedonia, our flesh had no rest, but we were troubled on every side; without were fightings, within were fears.

ISA 7:1. And it came to pass in the days of Ahaz the son of Jotham, the son of Uzziah, king of Judah, that Rezin the king of Syria, and Pekah the son of Remaliah, king of Israel, went up toward Jerusalem to war against it, but could not prevail against it.

ISA 7:2. And it was told the house of David, saying, Syria is confederate with Ephraim. And his heart was moved, and the heart of his people, as the trees of the wood are moved with the wind.

C. A lack of the Spirit & love of God:

1JOH 4:18. There is no fear in love; but perfect love casteth out fear: because fear hath torment. He that feareth is not made perfect in love.

D. Disobedience to God's Word:

DEU 28:58. If thou wilt not observe to do all the words of this law that are written in this book, that thou mayest fear this glorious and fearful name, THE LORD THY GOD;

DEU 28:65. And among these nations shalt thou find no ease, neither shall the sole of thy foot have rest: but the LORD shall give thee there a trembling heart, and failing of eyes, and sorrow of mind:

DEU 28:66. And thy life shall hang in doubt before thee; and thou shalt fear day and night, and shalt have none assurance of thy life:

DEU 28:67. In the morning thou shalt say, Would God it were even! and at even thou shalt say, Would God it were morning! for the fear of thine heart wherewith thou shalt fear, and for the sight of thine eyes which thou shalt see.

LEV 26:15. And if ye shall despise my statutes, or if your soul abhor my judgments, so that ye will not do all my commandments, but that ye break my covenant:

LEV 26:17. And I will set my face against you, and ye shall be slain before your enemies: they that hate you shall reign over you; and ye shall flee when none pursueth you.

LEV 26:36. And upon them that are left alive of you I will send a faintness into their hearts in the lands of their enemies; and the sound of a shaken leaf shall chase them; and they shall flee, as fleeing from a sword; and they shall fall when none pursueth.

JER 6:19. Hear, O earth: behold, I will bring evil upon this people, even the fruit of their thoughts, because they have not hearkened unto my words, nor to my law, but rejected it.

JER 6:22. Thus saith the LORD, Behold, a people cometh from the north country, and a great nation shall be raised from the sides of the earth.

JER 6:23. They shall lay hold on bow and spear; they are cruel, and have no mercy; their voice roareth like the sea; and they ride upon horses, set in array as men for war against thee, O daughter of Zion.

JER 6:24. We have heard the fame thereof: our hands wax feeble: anguish hath taken hold of us, and pain, as of a woman in travail.

JER 6:25. Go not forth into the field, nor walk by the way; for the sword of the enemy and fear is on every side.

E. Punishment for unrepented sin:

2CH 29:6. For our fathers have trespassed, and done that which was evil in the eyes of the LORD our God, and have forsaken him, and have turned away their faces from the habitation of the LORD, and turned their backs.

2CH 29:8. Wherefore the wrath of the LORD was upon Judah and Jerusalem, and he hath delivered them to trouble, to astonishment, and to hissing, as ye see with your eyes.

JOB 18:5. Yea, the light of the wicked shall be put out, and the spark of his fire shall not shine.

JOB 18:11. Terrors shall make him afraid on every side, and shall drive him to his feet.

ISA 48:22. There is no peace, saith the LORD, unto the wicked.

F. Evil spirits: