...other than because God said so?
There are good sound reasons to be moral and not suppress our Moral Conscience which is a manifestation of The Moral Law which God has inscribed (on us) and prescribed :
1. God in his love and thoughtfulness gave us a Moral Conscience so we would be above the animals of the Forest .
1.a. If we obey it, it not only benefits us but it makes for the best civil society imaginable.
2. It is a personal reflection of God himself who is infinitely moral, ethical, reighteous , holy, sacred, etc.... and he made us in his image. Therefore, we should try to maintain that high honor of being fashioned in his likeness as a love-gift back to him.
3. It helps us distinquish what is objectively right from wrong otherwise it is just peoples opinion if something is wrong, bad, or evil. The Moral Law IS the standard for which we judge everything according to...a standard higher and beyond ourselves .
4. When we are moral willingly, we feel good/better about ourselves and this feeling is a God thing also. Knowing we are living properly is good for our self esteem plus knowing we are pleasing God is very satisfying.
5. It is a good example to others on how to live.
6. It is something that we will be accountable for when we stand before Christ at the Judgement Seat of Christ, or for the Unbeliever...at the Great White Throne Judgement . It is called The Book of Works or Deeds.
7. It will afford Us the best and highest satisfaction and benefit if we are moral and ethical . We will be seen as trustworthy, not flighty, not self centered wanting what we want regardless of whether its right or wrong, we will be admired by others, and there is fruit that comes from living uprightly .
8. It is a good legacy to leave behind and it tends to stay in a persons mind .
9. Jesus sacrificed his life for us so that we could be free from the enslavement of sin which includes immorality .
10 . A victorious life of living morally, is objectively better than its counterpart and living according to this truth is what wise people of integrity do and strive for even though they do not always stay in step with Gods Moral Law as much as they want to.