Here's a good follow up article to last Sunday's sermon. The type of mourning called for in the second beatitude is lament. This article is helpful in understanding lament and how the Psalms can help us practice it.
Tired of Whining about Today’s Calamities? Open the Psalms of Lament. - LogosTalk
These psalms of lament teach us how to file a complaint with God. And complaining isn’t whining; it’s calling God’s attention to what he already knows.
- Very fitting to dwell on this reflection at any time, but especially with what's happening to all this year! God alone knows our anxieties, and He is there to help and guide us through our fears!