How do we know that Saul was chosen by God as king?

The selection of Saul as king is presented as a direct act of God, confirmed through Samuel's anointing and accompanying prophetic signs. Samuel provided Saul with specific prophetic insights about events that would unfold on his journey home, which served to reassure Saul of his divine appointment. This is a key indication of God's active role in leadership choices within Israel. Moreover, despite Saul’s initial hesitance and hiding, the fact that he rose to prominence shows God's sovereign will being realized through human choices, ultimately fulfilling God's covenantal promises.