The love of God is explained in chapter 5:
For this is the love of God, that we keep his commandments: and his commandments are not grievous.
1(1 John 5:3 For this is the love of God, that we keep his commandments: and his commandments are not grievous.)
Anytime the Bible is talking about love or love of God it is not talking about a squishy feeling you get inside. It’s talking about the keeping of the Commandments. You cannot give God a hug or a kiss to show him you love him. You show your love by obedience to the commandments. This is the same for a wife. A wife that loves her husband will submit to him.
For after this manner in the old time the holy women also, who trusted in God, adorned themselves, being in subjection unto their own husbands:
1(1 Peter 3:5 For after this manner in the old time the holy women also, who trusted in God, adorned themselves, being in subjection unto their own husbands:)