It helps to know a biblical definition of being Perfect is to be complete and lacking nothing.
We can see that even though the fear of the Lord is the Beginning of Wisdom, there is something Even greater, that is beyond knowledge and wisdom. It is having the Spirit of love indwell and work in us to full capacity. At this point we have nothing to fear for we know Gods love so richly and experientially that we do not fear the wrath that unbelievers must face.
Ephesians 3
17 That Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love,
18 May be able to comprehend with all saints what is the breadth, and length, and depth, and height;
19 And to know the love of Christ, which passeth knowledge, that ye might be filled with all the fulness of God.