The book of 1 John explicitly makes the case that loving Jesus, and by extension loving others, is the fundamental sine qua non of a Christian life. In chapter 4, John writes:
Dear friends, let us love one another, for love comes from God. Everyone who loves has been born of God and knows God. Whoever does not love does not know God, because God is love. This is how God showed his love among us: He sent his one and only Son into the world that we might live through him. This is love: not that we loved God, but that he loved us and sent his Son as an atoning sacrifice for our sins. Dear friends, since God so loved us, we also ought to love one another.
Loving others is the natural outflow of loving Jesus. Indeed, the Gospels argue that all right behavior is supposed to stem, not from conviction, but from love. As Jesus states this plainly in John 14:15 as such:
If you love me, keep my commandments.
Note the conditional is the love - If you love, then obey. It is explictly not, Obey so that i will love you.
When Jesus was asked to choose the greatest command in Mark 12, he continues this theme of linking the law as an outgrowth of love:
One of the scribes came near and heard them disputing with one another, and seeing that he answered them well, he asked him, “Which commandment is the first of all?” Jesus answered, “The first is, ‘Hear, O Israel: the Lord our God, the Lord is one you shall love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength.’ The second is this, ‘You shall love your neighbor as yourself.’ There is no other commandment greater than these
Paul is also consistent with the witness that we love because of Jesus' love for us. Romans 5:6-8 says:
You see, at just the right time, when we were still powerless, Christ died for the ungodly. Very rarely will anyone die for a righteous man, though for a good man someone might possibly dare to die. But God demonstrates his own love for us in this: While we were still sinners, Christ died for us.
Love is thus the action first of God. The natural response of love, is then to return (or spurn) the love of the initiator. If my wife comes up to me and kisses me, for me not to return that love would be weird at best. Worship is that natural response of love to the One who first loved us.