Gerhard and Walther

As Anthony saw a vision of the entire world being full of entrapments, he said: “Who then can escape from this entrapment?” Thereupon he received his answer: Sola humilitas, only true and inward humility.—Johann Gerhard, Schola Pietatis I:209. 

We also see how foolish it is for people to think the can hope for God’s grace while they continue to cling to open or secret sin. Such people make devil out of God. For it is the devil, not the holy God, who takes no notice of sin. Therefore, whoever has been clearly convinced that some behavior of his is a sin, who nevertheless refuses to let go that sin, and who comforts himself with the thought that God’s great grace applies to him is actually sinning against grace, trampling upon the Son of God who bled for his sins, considering the blood of the testament impure, and insulting the Spirit of grace.—C. F. W. Walther, God Grant It!, p. 231.