How do God's miracles affect people's hearts?

In scripture, we see that God's miracles, rather than softening people's hearts, often lead to greater hardness. This principle is evident in the account of Pharaoh. Each miracle and sign performed by Moses at God's command did not elicit repentance or a softened spirit in Pharaoh; instead, they further entrenched his opposition. This reflects a broader truth: without the work of grace through the Holy Spirit, human hearts respond to God's goodness with rebellion. Therefore, genuine conversion comes from grace, not merely from witnessing miracles or signs.