In Genesis 9:27, 'God spreading out Japheth' signifies his enlightenment. In a literal sense 'to spread out' signifies extending the borders, but in a spiritual sense, it signifies being enlightened. Enlightenment is the extension of the borders of wisdom and intelligence. In Isaiah 54:2, it signifies spiritual illumination or enlightenment. A member of the external church stretches out when he is instructed in the truths and goods of faith. As he is in charity, so he is more and more confirmed, and the more he is instructed, the more the cloud of his intellect is dissipated, which is where his charity and conscience resides.

(参照: Arcana Coelestia 1101)

1101. 'May God enlarge Japheth' means the enlightenment of that Church. In the literal sense 'enlarging' means extending boundaries, but in the internal sense it means being enlightened. Indeed enlightenment is an extension so to speak of the boundaries of wisdom and intelligence, as in Isaiah,

Enlarge the place of your tent, and let the curtains of your habitations be stretched out. Isaiah 54:2.

This stands for enlightenment in spiritual things. The member of the external Church is 'enlarged' when he receives instruction in truths and goods of faith. And because charity is present in him he is by this means confirmed more and more. Also, the more instruction he receives the more the cloud is dispersed in the understanding part of his mind in which charity and conscience are present.