Is it in line with the pali cannon suttas to accept other scriptures?

>According to the suttas Are human beings capable of discerning what dhamma is outside of the suttas? Is it possible to know enough from the suttas and then make use of the Abhidhamma? What about the mere possibility that a dhamma practitioner could make use of Jesus's teachings, Hindu teachings, Sufi teachings or sutras outside the the official Theravada context? When is it appropriate to be more closed minded? When is it appropriate to be more open minded?