How do we know Christ's blessings are for us?

In 2 Corinthians 1:20, it affirms that all the promises of God are 'yes' and 'amen' in Christ, emphasizing the assurance we have in Him. This means that Christ, through His sacrifice, satisfied the requirements for our salvation and secured all blessings for His people. The notion that we must contribute to our own salvation contradicts this glorious truth, as His work is perfect and complete, ultimately providing us with a firm assurance that His blessings are indeed for all who believe.