Rejoice with trembling

“Serve the Lord with fear, and rejoice with trembling.  Blessed are all who take refuge in him.” (Ps. 2:11,12)

Rejoice.  Tremble.  Two words that do not seem to belong together.  A deep understanding of the sovereignty of God should cause us to tremble.  But an even deeper understanding of his character, his goodness should cause us to rejoice.  To rejoice with trembling.  O blessed thought!  What words with heavenly comfort fraught!