"Many have in a great measure failed to receive the former rain. They have not obtained all the benefits that God has thus provided for them. They expect that the lack will be supplied by the latter rain. When the richest abundance of grace shall be bestowed, they intend to open their hearts to receive it. They are making a terrible mistake. The work that God has begun in the human heart in giving his light and knowledge, must be continually going forward. Every individual must realize his own necessity. The heart must be emptied of every defilement, and cleansed for the indwelling of the Spirit. It was by the confession and forsaking of sin, by earnest prayer and consecration of themselves to God, that the early disciples prepared for the outpouring of the Holy Spirit on the day of Pentecost. The same work, only in greater degree, must be done now. Then the human agent had only to ask for the blessing, and wait for the Lord to perfect the work concerning him. It is God who began the work, and he will finish his work, making man complete in Jesus Christ. But there must be no neglect of the grace represented by the former rain. Only those who are living up to the light they have, will receive greater light. Unless we are daily advancing in the exemplification of the active Christian virtues, we shall not recognize the manifestations of the Holy Spirit in the latter rain. It may be falling on hearts all around us, but we shall not discern or receive it."
I made bold the phrase you referred to. (And wrote down where it's found so I can read the whole article later. 8T & TM also have an entire chapter on the Latter Rain.)
I would say the vital part we have is to make sure we are submitting ourself to having God working on our hearts so that no part of the light He has already revealed to His people is not received. I don't know that there is any way to measure our progress, unless it's by how quickly we die to self no matter what the obstacle in our path.
I don't think there will be a great miracle. The virgins who had no oil in the parable awoke, but it was too late.