Holy fear is one Gift of the Holy Spirit we must rediscover and cherish:
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The law of fear was the Old Law that I gave to Moses. It was built on fear alone: Whoever sinned suffered the penalty.
The law of love is the New Law given by the Word, my only-begotten Son. It is built on love. The Old Law was not dissolved by the New, but fulfilled. This is what my Truth said: "I have come not to destroy the Law but to fulfill it." He thus joined the law of fear with that of love.
The imperfectness of the fear of suffering was taken away by love, and what remained was the perfectness of holy fear, that is, fear simply of sinning, not because of personal damnation but because sin is an insult to me, supreme Goodness. So the imperfect law was made perfect by the law of love.
(Jesus to St. Catherine of Siena in The Dialogue)