What is Pleasing to the Lord?

Heidelberg Catechism, Lords' Day 33, Q&A 91

Q. What are good works?
A. Only those which are done out of true faith,1 conform to God's law,2 and are done for God's glory;3 and not based on our own opinion or human tradition.4

1-John 15:5 Heb. 11:6.
2-Lev. 18:4; 1 Sam 15:22; Eph. 2:10.
3-1 Cor. 10:31.
4-Deut. 12:32; Isa.29:13; Ezek. 20:18;
Matt. 15:7-9