Psalm 145 is a thanksgiving to God for His goodness and mercy, for His love and because He strengthens and saves the weak.
That is why we see that the title says “Praise for the goodness and the power of God”. Will there be goodness in another like that which is in our God? Well no, only in our powerful God there is that goodness and that pure love that inspire confidence.
That is why David writes that psalm in thanks to God: