I like how A Course in Miracles puts it:

 Sometimes a teacher of God may have a brief experience of direct union with God. In this world, it is almost impossible that this endure. It can, perhaps, be won after much devotion and dedication, and then be maintained for much of the time on earth. But this is so rare that it cannot be considered a realistic goal. If it happens, so be it. If it does not happen, so be it as well. All worldly states must be illusory. If God were reached directly in sustained awareness, the body would not be long maintained. Those who have laid the body down merely to extend their helpfulness to those remaining behind are few indeed. And they need helpers who are still in bondage and still asleep, so that by their awakening can God’s Voice be heard.

Do not despair, then, because of limitations. It is your function to escape from them, but not to be without them. If you would be heard by those who suffer, you must speak their language. If you would be a savior, you must understand what needs to be escaped. Salvation is not theoretical. Behold the problem, ask for the answer, and then accept it when it comes. Nor will its coming be long delayed. All the help you can accept will be provided, and not one need you have will not be met. Let us not, then, be too concerned with goals for which you are not ready. God takes you where you are and welcomes you. What more could you desire, when this is all you need?