In verse one the word "come" is used four times. "Come" is a verb, an action word, a word full of movement. This word reminds us that God is always inviting his people to come and worship him. Remember the opening verses of Psalm 95:
Come, let us sing for joy to the Lord;
Let us shout aloud to the Rock of our salvation.
Let us come before him with thanksgiving
And extol him with music and song.
But in Isaiah 55 the invitation to come is addressed to those who are thirsty: "Come, all you who are thirsty." Isaiah then reminds his readers that "water" will satisfy their thirst. The spiritual application here is that only God can satisfy the deepest longings of our souls. As we come to God in worship He fills us with hope and joy and meets all of our needs.
In verses two and three the word "listen" is used three times and certainly implied a fourth time with the words "give ear." Are you a good listener? I have to constantly remind myself to be a good listener. We must all learn to listen to God and his instruction for our lives.
Let us all remember to come to God in worship and listen to his thirst-quenching words.