After Psalms pronounces blessings on the King and the curses on the enemies of God, Israel declares they will praise God:

Psa 21:13  Be exalted, O LORD, in your strength! We will sing and praise your power.

While Good Friday and Easter was several days ago, God’s strength is certainly displayed for the reason’s those holidays are both mourned and celebrated.  

God’s strength rose Christ up from the dead, that is some awesome power for sure!  Imagine being able to defeat death and live forever, that is beyond human comprehension, it supersedes anything that man can try and do, we have spent the last 3000 years just trying to live to 80, and it only took God 3 days to lift Christ out of the grave—  and He lives forever, therefore as the Psalms says, we will sing and praise your power, which is unfathomable to human understanding but it all happened for sure, 4 different books in the Bible written by 4 different people all tell us that Christ not only rose from the dead, the tomb was empty, but he was later seen by hundreds of people after He was crucified.