Associated symbols are important as well. In Moses we read about the tears of heaven on the mountain. In Lehi's dream we read about a fountain of living water flowing along a path that leads to the tree of life. I believe these symbols are linked. Zion is the mountain, a symbol of the elevation we experience when we covenant with God in the temple. That elevation leads to a calling to engage in the work of salvation:
81 Behold, I sent you out to testify and warn the people, and it becometh every man who hath been warned to warn his neighbor. (D&C 88)
As is often the case, if we look at other mentions of "tears" and "feet" in this context, a deeper layer of meaning unfolds. Consider these verses from the description of Jesus' visit to the New World:
10 And they did all, both they who had been healed and they who were whole, bow down at his feet, and did worship him; and as many as could come for the multitude did kiss his feet, insomuch that they did bathe his feet with their tears. (3 Nephi 17)