Today, the Holy Church puts at our disposal —through Christ's words— the reality of resurrection and the properties of resurrected bodies. The Gospel mentions Jesus' meeting with the Sadducees who, with a hypothetical and out-of-the-way example, present Jesus with a question about the resurrection of the dead, which they do not believe in, anyway.
They ask him, should a woman be widowed seven times, «to which of them will she be wife? For the seven had her as wife» (Mk 12:23). They were just trying to deride Jesus' doctrine. But, the Lord, just breaks this difficulty up by answering, «when they rise from the dead, men and women do not marry but are like the angels in heaven» (Mk 12:25).
And, taking advantage of the opportunity, Our Lord reaffirms the existence of resurrection by mentioning what God told Moses in the chapter of the burning bush: «I am the God of Abraham, the God of Isaac and the God of Jacob». And He adds, «He is the God, not of the dead but of the living» (Mk 12:26-27). Jesus also tells them how wrong they are, because they understand neither the Scriptures nor the power of God; what is more, this truth was already revealed in the Old Testament, for others, like Isaiah, the Macchabees' mother or even Job, already said it.
St. Augustine described the eternal life and the loving communion, like this: «There, you will have everything and you will not have limits or suffer any hardships, and your brother will also have everything; because you two will just become one and this one, will also own He Who will have you both».
Far from doubting of the Holy Scriptures and of God's merciful love and power, we shall adhere with all our mind and heart to this hopeful truth, while rejoicing for not being thwarted in our thirst of life, full and eternal, which the same God assures us, in its glory and happiness. Before this divine invitation we have nothing to do but to foment our anxious wish to see God, and to be always next to Him, in his Kingdom.