We should have the highest devotion to Him because of Who He is. We should then have the highest devotion to Him because of all that He has done for us.
If that alone doesn’t compel us, then we should have the highest standards of devotion for Him because of the abundant Biblical warnings about the consequences of those who treat Him casually.
We are entering the times when no one will make it who has not built their house solidly on the Rock. God even gives a strong warning in Revelation 3:16 regarding about being lukewarm. It is better to be either hot or cold and when it comes to having a relationship with God, when it comes to serving the King in His Kingdom it always is better to be hot for God. Having an abiding relationship with Jesus Christ is the only way we are going to make it.