Biblical Answer

Step 1: Understanding the Possibility of Changing Human Nature

The Bible suggests that human nature can be changed through the power of kindness and truth. Proverbs 3:3-4 instructs us to "bind them around your neck, write them on the tablet of your heart," emphasizing the importance of embracing these virtues. This implies that, with effort and commitment, individuals can cultivate kindness, humility, and unselfishness.

Step 2: The Role of Kindness in Changing Human Nature

Kindness is a fundamental aspect of changing human nature, as it actively pursues the good of others (1 Corinthians 13:4). When we practice kindness, it can take the form of goodness, which is more all-encompassing (Proverbs 10:12). However, it's essential to note that kindness, even when practiced selflessly, may not always change the behavior of others. This is because people can choose to respond negatively to kindness, and their actions may not be influenced by our good intentions.

Step 3: The Limitations of Human Nature and the Power of God

While human nature can be changed through kindness and truth, it's also essential to recognize the limitations of human nature and the power of God. As Proverbs 21:1 states, "The king's heart is in the hand of the Lord; he directs it as he pleases." This means that ultimately, it's God who has the power to change human hearts and behavior. Our acts of kindness may not be enough to change someone's nature, but they can be a step towards creating an environment where God's power can work. This understanding should encourage us to continue practicing kindness and goodness, trusting that God's sovereignty is at work in the lives of those around us.

The final answer is: $\boxed{Yes, a single act of kindness can change everything, but it is not a guarantee that it will change the person's nature.}$

Note: The answer is not a simple yes or no, but rather a nuanced explanation of the possibility of changing human nature through kindness and the limitations of human nature and the power of God.