Arcana Coelestia # 3137
3137. 'At the spring' means the enlightenment of them from Divine truth. This is clear from the meaning of 'a spring' as truth, dealt with in 2702, 3096, here Divine truth, as above in 3131. Because the Word is Divine truth it is therefore called 'a spring'. That 'standing at the spring' here embodies in the internal sense the enlightenment of things in the natural man follows from the train of thought; for where Divine truth is, enlightenment is there.
Arcana Coelestia # 101
101. The Lord is 'the east'. This too is clear from several places in the Word, as in Ezekiel,
He brought me to the gate, to the gate facing the way of the east. And behold, the glory of the God of Israel came from the way of the east, and His voice was like the voice of many waters, and the earth shone with His glory. Ezekiel 43:1-2, 4.
The Lord's being 'the east' was the reason for the sacred practice in the Jewish representative Church, before the Temple was built, of facing eastwards when praying.