Having studied the passage for yourself, you are in a better position to agree or disagree with the commentaries. Remember, we are commanded to study the Word, not what somebody else says about it. Go back to your Bible and read the text again, reevaluating in your own mind exactly what it is saying. When going to a Bible class takes with you the results of your own study of a passage. Don't just carry a commentary into class and read from it.
Commentaries can be valuable aids to private study.
Use them, but don't abuse them. For the more serious student a good set of Bible encyclopedias can prove to be of great service. Historical and geographical charts and maps are occasionally necessary. A topical Bible will give the student all the verses under a particular topic and can be very helpful in saving time. Additional books on various Bible subjects, such as books on doctrine, Christian evidences, and Christian living, should be secured.