If something is open for interpretation, it cannot be from God because "For God is not a God of disorder ." (1Cor 14:33)
Any interpretation is just the perspective of the one who interprets it. If a teacher comes from heaven, and leaves behind something for anyone to interpret in any way each one likes, what is the purpose of communication? Can an interpreter be absolutely sure that what he says is what Jesus really had in his mind?
If something is crystal clear, then it would be one of the signs that it may be from God.