Don't form a doctrine on one verse. Bring them all together and the the complete teaching. If there are many passages on a subject, it is an important subject -- get all of the passages together. If there very limited passages on a subject, don't give that as much significance compared to other more important teachings.
Such a mistake is shown in Scripture itself. In John 12:34 the multitude is interpreting only second coming prophecies as found in Daniel 7:13, 14 and they completely missed first coming prophecies such as Isaiah 53.
Parallel Words (comparing words)
Find other passages by the same author using the same word.
See how other writers of the same period used the word.
Parallel Ideas (comparing ideas or the same topic)
Example -- Image:
The general tenor of Scripture
Doctrine from the general teaching of Scripture: God is Omnipotent, omnipresent, omniscient.
Anthropomorphism: God pictured in human form. God is spirit, but spoken of in human terms.
Isaiah 6:1 (I saw the Lord); Exodus 33:11 (face to face); Exodus 33:18 (wants to see His glory); Exodus 33:20 (cannot see His face)
Compare Genesis 6:6 with Numbers 23:19 -- Cannot be literally interpreted, but must be understood in comparison to the general tenor of Scripture.