Dr. R.C. Sproul has said that God does not speak with a forked tongue — He cannot lie or contradict Himself. Jesus refuses to accept an interpretation of one passage that contradicts another. As we study the Bible we should be looking for ways to harmonize its teaching on various subjects. Make sure to let the clear parts of Scripture determine the interpretation of those parts that are less clear so that you will not create contradictions where none exist.
For further study:
The Bible in a year: