Mercy Over Sacrifice; Morals Over Commandments - Quick & Clear Bible Study

What is meant by mercy over sacrifice? Or how about morals over commandments?

Verses used in this study:
Hosea 6:6
Ps 40:6-8
Ps 51:16,17
Prov 21:3
Isaiah 1:11-17
Mic 6:6-8
Matthew 9:9-13
Matthew 12:1-12
Matthew 23:23
Matthew 22:35-40
1 Samuel 15:22
John 3:36