Augustine of Hippo
What does He convey in another Psalm? This lists particular transgressions. "These actions you have performed," He states and remains quiet. Was I indeed silent? Although He never fails to issue a command, He is silent regarding punishment: He restrains His wrath and does not declare judgment upon the guilty. Yet this individual asserts: I committed this and that, and God did not retaliate; look, I am fine, nothing has befallen me. You say, "I have done this," and I remained silent: you suspected wrongdoing as if I would be like you. What does it imply that I would resemble you? As you are unjust, you have perceived Me as unjust too; as if I were endorsing your sins instead of opposing or avenging them. And what does He say to you? I will confront you and present your actions before you.
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What does this mean? Because now, committing sin in secrecy, you elevate yourself, failing to recognize or assess your own actions; I will place you in front of Me, and I will bring upon you the consequences of your own deeds. Therefore, heed this: do not speak iniquity against God. Pay attention. Many individuals utter this injustice; however, they do not dare to do so openly, for fear of being shunned by the righteous: in their hearts, they brood over these matters, inwardly indulging in such impious thoughts; it brings them satisfaction to speak against God, and if their tongues remain silent, their hearts are not at peace. This is why it is stated in another Psalm, "The fool hath said in his heart, There is no God." The fool proclaimed this, yet he feared others: he kept silent in the presence of men; instead, he uttered it where only he could hear—regarding the One of whom he spoke. Thus, in this Psalm, He articulates: "Speak no iniquity against God."