1 John 3:23 And this is His commandment: that we should believe on the name of His Son Jesus Christ and love one another, as He gave us commandment.
Of all the commandments God has given us, the two which stand out the most and of which we are reminded the most are these: We love God and we love each other.
Yes, it takes faith to love God. Yes, it takes grace to love each other. That is the whole point.
To have faith and to exercise grace continually; Christ continued to remind everyone of these simple steps to keep close to Him.