Deuteronomy 11:1

Therefore you shall love the Lord your God, and always keep His charge, His statutes, His precepts, and His commandments (it is your obligation to Him).

When that decision is made to love God, it is easy to want to keep His commandments.  This is made easier when we realize all that God has done to save us from being condemned in sin.  Keeping the commandments of God was never intended to be a burden but a way to keep us safe from the lusts of this world.