CS Lews is one author known for his powers of what's called "rational inquiry".
No claim from him or from me that we are able to speak for others.

But instead a general claim that we can make robust observations about human nature.

Thus very very few of my comments are actually directed "at" any one person.  Feel free to watch me on this.

Instead I try to consider a general case, taking a snide remark and converting it into a broader question for examintion.

Lewis' point here is all about "tendencies" that the devil loves to take advantage of....the easier it is for us to "love someone" over there, not the one in our home, bathroom, car.

Love demands, always. 
Love demands a gift of ourselves.  
Otherwise our supposed acts of love are just "sweet words"...and for many "sweet and fleeting ideas" that never cause sweat or bleeding, the sort that Jesus gave us on the Cross. 

When you read Fazio's book, focus on the references to the Cross.