The Lord reigns over all things in creation - nothing is outside his righteous command, nothing is kept from his purview, nothing is beyond his reach. Christians delight not only in their salvation but in his lordship.
The descriptions of king and queen in Psalm 45 tightly parallel the wedding of Jesus and his bride, and lead us to consider the beauty and joy of our union with Christ, and his delight in his bride, the Church.
When it seems things aren't going well and everything is against us, the perception might be that God has abandoned us, that he has broken his covenant with us. Psalm 44 is a helpful reminder to cry out to for God to act on our behalf in accordance with his promises.
‘“Psalm 40” is interesting in that it suggests a time in which grace will replace karma, and love replace the very strict laws of Moses (i.e. fulfill them). I love that thought. David, who committed some of the most selfish as well as selfless acts, was depending on it. That the scriptures are brim full of hustlers, murderers, cowards, adulterers and mercenaries used to shock me; now it is a source of very great comfort.’ — Bono, The Book of Psalms, Introduction.
The work of Calvary and the Resurrection are demonstrations and guarantees that God’s plan of salvation has always been, is and always will be to save and secure those who put their faith in him.