Obedience is not just an action words but a continuous action , which implies that one practice is when you are happy, when you are sad, when you are alone and when you are not alone.
When God made obedience a commandment, God made it a must and a responsibility for every Christian to adhere to. God's will can be said to be his commandments, His word. The bible made is very clear that the acess which you can say to the gateway to heaven is adhering to His word.
When you read the bible and obey what is written in the bible you are obeying His will. God said when you obey this word Himself (God) will be with you that is He will dwell with you and when He dwells with one favour follows, blessings follows and one will have acess to heaven at last.
That is why God said obedient is better than Sacrifice, when one obeys he/she reaps the fruit of the land. The fruit of the land there means blessings, carrying the presence of God and prosperity that man can not explain .