8 We, therefore, Venerable Brethren, rejoicing in these happy beginnings of a noble piety, and seeing in its further extension a powerful help against the evils that assail us; must, at the same time, endeavour, as far as in us lies, to second the most sweet counsel of the Divine Goodness; so that this secret calling, breathed by the Holy Spirit into the minds of men, may not be deprived of the much-desired abundance of heavenly graces. Moreover, We do this the more willingly because We see what has already been done by Our Predecessors. For, long since, this Apostolic See, which had often commended the Spiritual Exercises by word, taught the faithful by its own example and authority, converting the august Vatican temple into a Cenacle for meditation and prayers; which custom We have willingly received, with no small joy and consolation to Ourselves. And in order that we may secure this joy and consolation, both for ourselves and for others who are near us, We have already had arrangements made for holding the Spiritual Exercises every year in the Vatican.
Source: Mens Nostra (Vatican.va)