Words have meanings and the meaning can change from time and place according to our circumstance. Pastor Mark Forest encourages his congregation to study the Bible from the perspective of the audience to whom it was written.
Take the unicorn:
If you get an old 1828 Noah Webster’s Dictionary, which is the very first edition dictionary that Webster came out with about 200 years ago, and look up the word “unicorn” it says:
Unicorn – An animal with one horn; the monoceros. this name is often applied to the rhinoceros. Unicorn and bicornis varieties. Read the verses again with the raw, powerful image of the rhino in mind. The director of Fossil Rim in Glen Rose once told me that he saw a white rhino toss a female rhino. 
They can be over 5,000 pounds. This is not the image of the sweet beautiful horse painted in pink.
“God brought them out of Egypt; he hath as it were the strength of an unicorn.”
Numbers 23:22 KJV
“God brings them out of Egypt; He has strength like a wild ox.”
Numbers 23:22 NKJV
http://bible.com/114/num.23.22.nkjv
“Will the unicorn be willing to serve thee, or abide by thy crib?”
Job 39:9 KJV
http://bible.com/1/job.39.9.kjv
““Will the wild ox be willing to serve you? Will he bed by your manger? Can you bind the wild ox in the furrow with ropes? Or will he plow the valleys behind you?”
Job 39:9-10 NKJV
http://bible.com/114/job.39.9-10.nkjv
