The Way of Perfection, by Teresa of Avila (1515-1582)
Describes the importance of not turning back when one has set out upon the way of prayer. Repeats how necessary it is to be resolute.
Another reason, very much to the point, is that a resolute person fights more courageously. He knows that, come what may, he must not retreat. He is like a soldier in battle who is aware that if he is vanquished his life will not be spared and that if he escapes death in battle he must die afterwards. It has been proved, I think, that such a man will fight more resolutely and will try, as they say, to sell his life dearly, fearing the enemy's blows the less because he understands the importance of victory and knows that his very life depends upon his gaining it. We must also be firmly convinced from the start that, if we fight courageously and do not allow ourselves to be beaten, we shall get what we want, and there is no doubt that, however small our gains may be, they will make us very rich. Do not be afraid that the Lord Who has called us to drink of this spring will allow you to die of thirst. This I have already said and I should like to repeat it; for people are often timid when they have not learned by experience of the Lord's goodness, even though they know of it by faith. It is a great thing to have experienced what friendship and joy He gives to those who walk on this road and how He takes almost the whole cost of it upon Himself.
- Chapter 23
(Keep in mind that she is writing to sisters in a cloistered contemplative order.)