Gregory the Great
Behold me and marvel, Job 21:5, 43. This means to reflect on my actions and be astonished by the trials I have endured under this affliction. He rightly adds the phrase, "And place your finger upon your lips." This gesture implies, in clearer terms, that understanding the good I have accomplished and recognizing the adversities I have faced should lead you to refrain from speaking any wrongful words. In my suffering, you may sense the reality of your own pain. Our fingers allow us to discern the attributes of things, which is why wisdom is aptly represented by them; as the Psalmist proclaimed, "Blessed be the Lord my God, who teaches my hands to wage war and my fingers to engage in battle" (Psalms 143:1). In this context, "hands" symbolizes actions, while "fingers" represent wisdom.
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Therefore, to "place your finger upon your lips" signifies that one’s speech is guided by prudence so that it does not stray into foolishness. Thus, he advises to "put your finger upon the mouth"; that is, "attach the virtue of carefulness to your words, so that when you speak against a hypocrite, you may identify those who rightly deserve such criticism." The passage continues.