10 At what season does the Saviour rise? Is it the season of summer, or some other? In the same Canticles immediately before the words quoted He says, The winter is past, the rain is past and gone; the flowers appear on the earth; the time of the pruning has come. Is not then the earth full of flowers now, and are they not pruning the vines? You see how he said also that the winter is now past. For when this month Xanthicus has come, it is already spring. And this is the season, the first month with the Hebrews, in which occurs the festival of the Passover, the typical formerly, but now the true. This is the season of the creation of the world: for then God said, Let the earth bring forth herbage of grass, yielding seed after his kind and after his likeness. And now, as you see, already every herb is yielding seed. And as at that time God made the sun and moon and gave them courses of equal day (and night), so also a few days since was the season of the equinox.
At that time God said, let us make man after our image and after our likeness. And the image he received, but the likeness through his disobedience he obscured. At the same season then in which he lost this the restoration also took place. At the same season as the created man through disobedience was cast out of Paradise, he who believed was through obedience brought in. Our Salvation then took place at the same season as the Fall: when the flowers appeared, and the pruning had come.
Source: Catechetical Lectures (New Advent)