A story is told of Rabbi Nahman of Breslov when he was a child.
Whenever it seemed to him that he had sinned, he would blush in shame before God.
Generally, fear is an emotion of distance, in contrast to love, which is one of attraction.
In this sense, the most elevated fear is not a recoiling from that which is undesirable, from that which is painful or frightening, but rather retracting due to the awareness of “Who is it whose heart dared to approach Me? – the utterance of the Lord” (Jer. 30:21), from the feeling of shame one experiences when he is aware of his nothingness in the presence of God.
Rabbi Adin Steinsaltz