The Greek Exegesis of the Greek term "I am the gate".
Gate or Door - Thura Thoo-rah! The opening or the closure.
1. Old Testament models for the shepherd image, for going in and out, and for door prediction (especially in the messianic context of Ps. 118:19-21: "Open for me the gates of righteousness; I will enter and give thanks to the LORD. 20 This is the gate of the LORD through which the righteous may enter. 21 I will give you thanks, for you answered me; you have become my salvation."
2. The basic lesson here is that Christ alone mediates membership in the messianic community and reception of its blessing of salvation and eternal life.
3. The idea of door/gate eschatology denotes the granting of salvation for the symbol of the open door whereas the symbol of the closed door is defined as the refusal of salvation.