How do we know God's promise to give rest is true?

Isaiah 55:1-3 illustrates the invitation for weary souls to come to God for rest and nourishment. This promise is anchored in God's character, which is unchanging and faithful. When we recognize our burden of sin and our inability to meet God's law, we qualify for His invitation: to come and receive rest. This is not a mere offer but a certain promise based on God's covenant mercies. As seen in Matthew 11:28-30, Christ invites the heavy-laden to find rest through Him, confirming the reliability of God's promise.