Today is Good Friday which is still recognized in the post-Christian West as a memorial and celebration of the Easter Friday that Jesus Christ willingly gave His life on the Cross, as the Passover Lamb, to vicariously pay our penalty, owed to God the Father, for our sins. He gave His life so that those who accept His once-only-forever-never-to-be-repeated sacrifice, by trusting in Him, as Lord and Saviour, might be redeemed to the Father, whose justice is served, who then cannot even see our sin. We are washed clean in the blood of the Lamb. This covenant was sealed and perfected in Christ’s resurrection, which is celebrated on Sunday.
The following is a summary of what John Calvin wrote on the matter.
by John Calvin (abridged)1,2
2. None of the ancient philosophers, except Plato, acknowledge the chief good of man to consist in his union with God. But of the nature of this union, Plato had not the smallest idea. We know what is the only and perfect happiness even in this earthly pilgrimage; but it daily inflames our hearts with increasing desires after it, till we shall be with its full fruition—the resurrection.
3. Let the importance of the object sharpen our pursuit. Paul argues, that if there be no resurrection of the dead, the whole Gospel is vain and fallacious; for we should be “of all men most miserable” (1 Corinthians 15:13-19). To this subject, the most important of all, let us give attention never to be wearied by the length of time.