Pastor and author Tim Challies provides a helpful set of criteria for examining doctrine (belief or set of beliefs).
"The task of the Christian is to evaluate every doctrine to declare it fit or unfit. John Stott says it characteristically well: “Christian doctrine is healthy in the same way as the human body is healthy. For Christian doctrine resembles the human body. It is a coordinated system consisting of different parts which relate to one another and together constitute a harmonious whole. If therefore our theology is maimed (with bits missing) or diseased (with bits distorted), it is not ‘sound’ or ‘healthy’.” Doctrine that passes the three tests is sound doctrine. It is pure and undefiled, true according to God’s unfailing standard of truth."