We know the Love Of Christ by faith.   We simply choose to believe the WordsOfJesus about His Perfect Love for us.   We simply take to heart His sacrifice for us.   

When we begin to fathom the Love Of Christ for us we are perfect as He is perfect.   

I in them, and you in me, that they may be made perfect in one; and that the world may know that you have sent me, and have loved them, as you have loved me. Joh 17:23 `I in them`    ➛ is the Faith Of Christ in us.      `You in me`    ➛ is the Holy Spirit In Christ Jesus.      ` Perfect in one`    ➛ speaks to the New Spirit being that we become by Grace Through Faith In Christ Jesus who is a child of the Holy Spirit.      So, we see that the Holy Spirit is in us because we are In Christ and are perfect in our New Spirit.      The world He is speaking of is the people in the world - particularly those who have not heard the Gospel.     The evidence of a transformed life will speak as light and truth to those who are lost.

But whoso keeps his word, in him truly is the love of the Holy Spirit perfected: hereby know we that we are in him. 1Jn 2:5 Here it makes it clear that the 'commandments' in the previous verses are referring to the Words of Jesus which produce freedom and life in the hearer.      When faith in His Words becomes Heart Faith we truly know the Lord and the Lord`s love is perfected in us.     We are In Christ.

He that loves not knows not the Holy Spirit; for the Holy Spirit is love. 1Jn 4:8 To be In Christ is to be in love because the Holy Spirit is love.

No man has seen the Holy Spirit at any time.     If we love one another, the Holy Spirit dwells in us, and his love is perfected in us. 1Jn 4:12 We are perfected by the Holy Spirit in us and us in Him..

And we have known and believed the love that the Holy Spirit has to us.     The Holy Spirit is love; and he that dwells in love dwells in the Holy Spirit, and the Holy Spirit in him. 1Jn 4:16 We become part of Jesus by His indwelling Word and Holy Spirit.     We are members of the Body Of Christ who is the Head.

There is no fear in love; but perfect love casts out fear: because fear has torment.     He that fears is not made perfect in love. 1Jn 4:18 Fear and love are mutually exclusive.         ➛ Fear has torment.         ➛ Love has peace.      When a person encounters the love of the Holy Spirit as demonstrated by Christ Jesus they enter into Grace.      As a believer fellowships with Christ in His Word and by Praying In The Spirit their awareness of His love grows and they experience more of His Grace.      Eventually, all fear vanishes as His perfect love is realized.      A believer who is not living a victorious life but is dealing with fears has not come to the realization of our Lord`s perfect love for them.     Our ministry to those in fear is to teach them of His love.