Psalm 56:8

"Thou tellest my wanderings: put thou my tears into thy bottle:" 

According to www.lachrymatory.com, David is referring to an ancient practice called lachrymatory. It is believed that in the eastern world, when a person would die, rather than sending flowers as we do in our tradition, they had small decorative vials that they would hold under their eyes and put their tears in the bottle. They would deliver the bottle to the family of the deceased as an expression of grief, compassion, and sorrow.

In Psalm 56, David took the practice of lachrymatory to another level. He described God as holding the bottle and collecting tears. In this instance they were not tears shed for a deceased person. These were tears of repentance, thus the reason David says, "thou tellest my wanderings." He was referring to the many times that he had wandered from God's instructions following the path of disobedience. David's wanderings often resulted in tears of repentance as he demonstrated in Psalm 51 following his sin with Bathsheba and then having her husband killed. The bottle that God held for David contained tears of repentance for the wanderings he had committed.

Acts 17:30 reads "In the past God overlooked such ignorance, but now he commands all people everywhere to repent." 2 Chronicles 7:14 reads "If my people, who are called by my name, will humble themselves and pray, and seek my face, and turn from their wicked ways, then I will hear from heaven, and I will forgive their sin and will heal their land. A dominate ill of our present world is God holding an empty bottle.