I know by the convictions of my own conscience, and by experience. Thy judgments, i.e. thy corrections, as the next clause explains this. In faithfulness; in pursuance of thy promises, and in order to my good, that by my afflictions thou mightest purge me from those sins which might provoke thy wrath against me, and prepare me for a better administration, and more lasting and comfortable enjoyment of my kingdom.
Related Commentaries of Psalms 119:75
Psalms 119:75
75 I know, O LORD, that thy judgments are right,h and that thou in faithfulness hast afflicted me.