From; Ellen G. White
We are to make the best of our present opportunities. There will be no other probation given to us in which to prepare for heaven. This is our only and last opportunity to form characters which will fit us for the future home which the Lord has prepared for all who are obedient to His commandments.

There will be no probation after the coming of the Lord. Those who say that there will be are deceived and misled. Before Christ comes just such a state of things will exist as existed before the Flood. And after the Saviour appears in the clouds of heaven no one will be given another chance to gain salvation. All will have made their decisions.—Letter 45, 1891. LDE 236.3 - LDE 237.1