Easy answer. We follow the Law because we love God. Love and Law go together like mountains and valleys. Jesus says it this way.
And because lawlessness will be increased, the love of many will grow cold. (Matthew 24:12, ESV)
Interesting how Jesus equates Law and love, isn’t it? As people move away from the Law, they move away from love. So if we want to get closer to God, we get closer to His Laws. Every tiny little command we follow is loving Him that much more. He loved us first, and we love Him in a small way by doing everything He says.
“This is my commandment, that you love one another as I have loved you. (John 15:12, ESV)
We love because he first loved us. (1 John 4:19, ESV)
Some people insist on questioning the Law. They liken it to “slavery,” or “legalism,” or stuff we cannot do. They view God as a sadist because He gives us “laws” that we cannot follow. They don’t see the Law as love, because they do not understand love. Their hard hearts prompt them to resent the Law as burdensome requirements imposed from the outside on the unwilling. They see God as a harsh taskmaster who doesn’t deserve the smallest return on His investment (Matthew 25:24).
But our hearts are flesh, and have the Law written on them by the Spirit (Jeremiah 31:31-34). We delight in every word God speaks, and work at whatever He suggests. We love others in the Body with a similar love, because He first loved us. After all, Jesus gave Himself for us to redeem us from all lawlessness. He paid the penalty for disobedience to God’s Laws, so we don’t have to worry that if we make a mistake we will be separated from Him again. He is not waiting to hammer us for the smallest misstep. He longs for us to respond to His Words of Life and have life more abundantly. His Word trains us to renounce ungodliness and worldly passions, and to live self-controlled, upright and godly lives, zealous for good works.
For the grace of God has appeared, bringing salvation for all people, training us to renounce ungodliness and worldly passions, and to live self-controlled, upright, and godly lives in the present age, waiting for our blessed hope, the appearing of the glory of our great God and Savior Jesus Christ, who gave himself for us to redeem us from all lawlessness and to purify for himself a people for his own possession who are zealous for good works. (Titus 2:11–14, ESV)