Help in Spiritual Reading

Quid Est Veritas? has some good guidelines from St. Alphonsus Liguori on how to read so that the reading will benefit your soul:

It is, in the first place, necessary to recommend yourself beforehand to God, that he may enlighten the mind while you read. It has been already said, that in spiritual reading the Lord condescends to speak to us; and, therefore, in taking up the book, we must pray to God in the words of Samuel: Speak, Lord, for thy servant heareth. Speak, O my Lord, for I wish to obey Thee in all that Thou wilt make known to me to be Thy will.

In the second place, you must read not in order to acquire learning, nor to indulge curiosity, but for the sole purpose of advancing in divine love. To read for the sake of knowledge is not spiritual reading, but is, at the time of spiritual reading, a study unprofitable to the soul. It is still worse to read through curiosity. What profit can be expected form such reading? All the time devoted to such reading is lost time. St. Gregory says that many read and read a great deal, but, because they have read only through curiosity, they finish reading as hungry as if they had not been reading. Hence the saint corrected a physician called Theodore for reading spiritual books quickly and without profit.

To derive advantage from pious books it is necessary to read them slowly and with attention. "Nourish your soul," says St. Augustine, "with divine lectures." Now to receive nutriment from food, it must not be devoured, but well masticated. Remember, then, in the third place, that to reap abundant fruit from pious reading, you must masticate and ponder well what you ready; applying to yourself what is there inculcated. And when what you have read has made a lively impression on you, St. Ephrem counsels you to read it a second time.

Besides, when you receive any special light in reading, or any instruction that penetrates the heart, it will be very useful to stop, and to raise the mind to God by making a good resolution, or a good act, or a fervent prayer. St. Bernard says, that it is useful then to interrupt the reading, and to offer a prayer, and to continue to pray as long as the lively impression lasts. Let us imitate the bees, that pass not from one flower to another until they have gathered all the honey that they found in the first. This we should do, although all the time prescribed for the reading should be spent in such acts; for thus the time is spent with greater spiritual profit. Sometimes it may happen that you draw more fruit from reading a single verse than from reading an entire page.

Moreover, at the end of the reading you must select some sentiment of devotion, excited by what you have read, and carry it with you as you would carry a flower from a garden of pleasure.