Do we have the capacity to love?

If we have been born again of water and the Holy Spirit, then yes, we have the capacity to love with the love of God.  It says in Romans 5:5 "Now hope does not disappoint, because the love of God has been poured out in our hearts by the Holy Spirit who was given to us.".  There are many people who hope for things but they never come to realization.  There are many people who hope but the hope turns to disappointment.  That is not the case when our hope has as its substance faith in the word of God.  So our faith in the word of God is what guarantees our hope.  This also is a manifestation of the love of God which has been shed into our hearts by the Holy Spirit.