That is not to say that David always controlled himself, as we know from his sin with Bath - sheba and his initial reaction to Nabal’s greed.
وَهٰذَا وَاضِحٌ مِنْ خَطِيَّتِهِ مَعَ بَثْشَبَعَ وَرَدَّةِ فِعْلِهِ عِنْدَمَا أَهَانَهُ نَابَالُ .‏