If you are willing and obedient, you will eat the best from the land.
Far to often people think that because of certain circumstances in their life, or because of what other people have done, this will affect their outcome in life. But the truth is your outcome in life is only determined by the choices you make. The devil is the one who wants you to get caught up with what others do, and focused on things in the natural. In doing so he has taken your focus off of what God has planned for your life.
The above verse in Isaiah is an absolute. The only conditions to getting the best God has awaiting you in this life is your willingness and obedience to Him. When you understand this it should change what you are focused on. Your daily focus should be on walking in obedience to what God has for you to do. It does not matter what other people do, nor what circumstances in life may come, if you focus on doing what God has called you to do those things cannot keep you from your god-given destiny.
Stay focused on being obedient to God and doing whatever He desires of you with a willing heart. To be willing simply means you obey without argument, and you put your whole heart into it. If you focus on this you will succeed. Stop allowing the devil to get you to focus on or to even think that people or problems can stop you. Just stay focused on what God has called you to do, and you are assured that what God has planned for your life which is good will come to pass, if you are willing and obedient.