Arcana Coelestia # 3065
3065. 'Behold, I am standing beside a spring of water' means a state when within the Human conjunction takes place involving Divine truth. This is clear from the meaning of 'a spring' as truth, dealt with in 2702, here Divine truth since the subject is the Lord. The state itself in which the conjunction takes place is meant by 'standing beside the spring'; and the fact that it was effected within the Human is evident from the train of thought.
Mercy
In regular language, "mercy" means being caring and compassionate toward people in poor states. That's a position we are all in relative to the Lord, all the time. Without Him we would be unable to choose what is good; without Him we would be unable to formulate a reasonable thought. Without Him, in fact, we would instantly cease to exist; we have life only because He constantly gives us life. So we are, quite literally, at His mercy. Fortunately, the Lord is caring and compassionate to a degree we cannot fathom. He is the source of all caring and all compassion, and of love itself. His mercy toward us never lessens, never abates, never ends; His whole purpose is to bring each of us, individually, to heaven. The meaning of "mercy" in the Bible is closely tied to this idea: it represents love in a general sense, and the desire for good that comes from love. It can also represent the desire for good and the ideas that describe it when those thoughts and desires are inspired by love of the Lord.