Charles H. Spurgeon on Psalms 2:11

"Serve the Lord with fear, and rejoice with trembling." There are two kinds of serving and rejoicing in God. First, a serving in security, and a rejoicing in the Lord without fear; these are peculiar to hypocrites, who are secure, who please themselves, and who appear to themselves to be not unuseful servants, and to have great merit on their side, concerning whom it is said (Psalm 10:5), "Thy judgments are far above out of his sight;" and also afterwards (Psalm 36:1), "There is no fear of God before his eyes." These do righteousness without judgment at all times; and permit not Christ to be the Judge to be feared by all, in whose sight no man living is justified. Secondly, a serving with fear and a rejoicing with trembling; these are peculiar to the righteous who do righteousnesses at all times, and always rightly attemper both; never being without judgments, on the one hand, by which they are terrified and brought to despair of themselves and of all their own works; nor without that righteousness on the other, on which they rest, and in which they rejoice in the mercy of God. It is the work of the whole lives of these characters to accuse themselves in all things, and in all things to justify and praise God. And thus they fulfil that word of Proverbs 28:14, "Blessed is the man that feareth alway;" and also that of Philippians 4:4, "Rejoice in the Lord alway." Thus, between the upper and nether millstone (Deuteronomy 24:6), they are broken in pieces and humbled, and the husks being thus bruised off, they come forth the all-pure wheat of Christ. Martin Luther.