Visions

Proverbs 29:18 Where [there is] no vision, the people perish: but he that keepeth the law, happy [is] he.

A vision is a supernatural revelation God gives a man about His plans and purposes. Visions come in many forms; some come as trances (when man's physical senses are suspended but their spiritual eyes can see what Godis revealingto them), some during the night through dreams, others by perceiving or understanding God's word, others come when one receives a word from God, some come through images and symbols with specific interpretation, others come through prophets and others come to a man during the day even when their senses are not suspended usually when an angel or Jesus appears to such a man (open visions).

When the Bible says my people perish because they lack vision. It means they lack a clear understanding of what God intends them to do. In the book of Samuel, in the times of Eli, the Visions of God were rare. It means God's visitations to reveal His plans and purposes were rare even to prophets of the day like Eli.

What's God's vision for your life? Believe God to reveal it to you either by perception, a dream, a trance or a prophet.

Further scriptures 

Genesis 15:1 After these things the word of the LORD came unto Abram in a vision, saying, Fear not, Abram: I [am] thy shield, [and] thy exceeding great reward.

Genesis 46:2 And God spake unto Israel in the visions of the night, and said, Jacob, Jacob. And he said, Here [am] I.

Numbers 12:6 And he said, Hear now my words: If there be a prophet among you, [I] the LORD will make myself known unto him in a vision, [and] will speak unto him in a dream.

Numbers 24:3-4 And he took up his parable, and said, Balaam the son of Beor hath said, and the man whose eyes are open hath said: He hath said, which heard the words of God, which saw the vision of the Almighty, falling [into a trance], but having his eyes open:

1 Samuel 3:1 And the child Samuel ministered unto the LORD before Eli. And the word of the LORD was precious in those days; [there was] no open vision.

Job 4:13 In thoughts from the visions of the night, when deep sleep falleth on men,

Ezekiel 7:13 For the seller shall not return to that which is sold, although they were yet alive: for the vision [is] touching the whole multitude thereof, [which] shall not return; neither shall any strengthen himself in the iniquity of his life.

Daniel 10:7 And I Daniel alone saw the vision: for the men that were with me saw not the vision; but a great quaking fell upon them, so that they fled to hide themselves.