Deuteronomy 7:9 tells us "Know therefore that the Lord thy God, he is God, the faithful God, which keepeth covenant and mercy with them that love him and keep his commandments to a thousand generations;

How does one obtain Mercy? Matthew 5:7 Blessed are the merciful: for they shall obtain mercy.

Matthew 9:27 "And when Jesus departed thence, two blind men followed him, crying, and saying, Thou son of David, have mercy on us." Jesus gave mercy to them by giving them their sight.

Perhaps what we should do in that which we are admonished in Hebrews 4:16 "Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need."