Shared ground
Saul’s response is immediate and emotional: he recognizes David’s voice, calls him “my son,” and weeps (v.16). He then makes a moral comparison, admitting David has acted better toward him—returning good for Saul’s evil (v.17). Saul also highlights the central fact of the episode: David had the power to kill him but chose not to (v.18). Saul treats that restraint as unusual and praiseworthy (v.19).
Saul’s words also move beyond the cave scene into political future: he says he “knows” David will surely be king and that Israel’s kingdom will be firmly established in David’s hand (v.20). The passage presents Saul himself as acknowledging David’s coming rule.
Where interpretation differs
Some readers take Saul’s confession as sincere repentance and a real turning point. Others read it as a short-lived emotional reaction under pressure—real tears and real words, but not a settled change of direction.
There is also some difference in how people hear Saul’s statement that David is “more righteous” (v.17). Some hear it mainly as an ethical claim (“you did the right thing”), while others hear an additional public/legal flavor (“you are in the right in this dispute”).
Finally, Saul’s “Yahweh delivered me into your hand” (v.18) is understood in two main ways: either as a direct claim of God’s active arranging of events, or as Saul interpreting a dangerous circumstance through God-talk without clarifying how much agency is being claimed.
Why the disagreement exists
The story itself gives strong evidence for what Saul says and feels here, but it does not explicitly narrate what Saul’s inner motives are, or whether he will remain consistent afterward. Also, the key phrases (“more righteous,” “Yahweh delivered,” “I know”) can be read as either carefully chosen admissions or as conventional, high-pressure speech in a royal conflict.
What this passage clearly contributes
Explicitly, the text shows Saul publicly conceding moral ground to David: David repaid good for evil, and David refused to kill Saul when he had the chance (vv.17–18). It also shows Saul recognizing how unexpected that mercy is (v.19) and invoking Yahweh as the one who can repay David for it (v.19).
By direct statement, Saul also serves as a narrative witness to David’s future kingship (v.20). The passage therefore links David’s present restraint with a future, stable rule over Israel—at least in Saul’s expressed assessment—without claiming that Saul’s acknowledgment automatically ends the conflict.