Last week I used introductory comments from Ignatius to define the Spiritual Exercises and their purpose. In 1536 Ignatius wrote a letter to a Father Miona in which he commends the Exercises. In fact, he implores his friend to take the Exercises and almost dares him not to enjoy and be benefited by them!
Let me repeat once and twice and as many more times as I am able: I implore you, out of a desire to serve God our Lord, to do what I have said to you up to now. May His Divine Majesty never ask me one day why I did not ask you as strongly as I possibly could! The Spiritual Exercises are all the best that I have been able to think out, experience and understand in this life, both for helping somebody to make the most of themselves, as also for being able to bring advantage, help and profit to many others. So, even if you don’t feel the need for the first, you will see that they are much more helpful than you might have imagined for the second.
See: Letter 6, ‘In praise of the Spiritual Exercises‘ in Saint Ignatius of Loyola: Personal Writings, Penguin Classics, 138-139.