How can we be certain of our salvation according to John 3?

In John 3:16, we find one of the most profound assurances of salvation: 'For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.' This promise emphasizes that salvation comes through faith in Christ alone. It reassures believers that those who look to Jesus in faith, recognizing Him as the substitute for their sins, will be granted eternal life. This is not based on our works or merits but on God's great love and grace, providing a firm foundation for our assurance in Christ.