​The Principle of God's Dealing With Man

Psalm 18:25-27

25  With the merciful thou wilt shew thyself merciful; with an upright man thou wilt shew thyself upright; 
26  With the pure thou wilt shew thyself pure; and with the froward thou wilt shew thyself froward. 
27  For thou wilt save the afflicted people; but wilt bring down high looks.