When we say the Good things that the Lord fills our mouth with, our entire self gets renewed. It’s the words that we speak, that ages us closer to the miserableness of oldness (feebleness) or keeps us young and dynamistic in His presence. Our words come from our thoughts, so when the Lord promises to fill us with good words (that will eventually actualize as we speak), He is promising to give us thoughts of refreshment, wisdom, purity, nobleness, praiseworthy and goodness. Blessed Be His Holy Name!
“(The Lord) Who satisfies your mouth with good things, So that your youth is renewed like the eagle’s.” Psalms 103:5