Historians and Bible scholars analyze the Canonical Gospels, Talmud, Gospel according to the Hebrews, Gnostic Gospels, Josephus, and other early documents attempting find the Historical Jesus. They try to separate reliable historical data from that which is not. A number of methods have been developed to critically analyze these sources.
The principal sources of information regarding Jesus' life and teachings are the four canonical gospels, especially the Synoptic Gospels,(Matthew, Mark and Luke) though some scholars argue that other texts (such as the Gospel of Thomas) are as relevant as the canonical gospels to the historical Jesus.
The Quest for the Historical Jesus proceeds with strong impetus. Albert Schweitzer showed how histories of Jesus had reflected the historians' bias. The work continues.