I found this meditation by anonymous to be good and moving. But this is not for mental prayer, only books containing reflections for Lent and Advent.
Anything that is especially moving or that is very fruitful for meditating
Anonymous - Considerations and Devout Meditations for Every Day During the Holy Season of Lent
‘There is nothing more united and less united than the soul and body. When one advances, the other recoils; when one rises, the other descends; when one is in health, the other is sick; when one is strong, the other is weak. It is necessary, then, in order to strengthen and give health to the soul, to bring the body under subjection, and weaken its evil propensities by penance and mortification. I am not a man if I obey my passions; I am not a Christian if I do not combat with and overcome my passions; I am not a true penitent if I do not mortify my passions. Since my body is polluted by sin, it ought to be purified by pain; and since it has part in the pleasures of the soul, it ought to glory in sharing its sorrows.’
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Anonymous - Meditations for Advent and Easter
‘Oh, what a holy, beautiful, peaceful light is the light of the Infant Heart of Jesus! How it longs to come forth and manifest itself to all, to console, to instruct, to illuminate! Are we, also, longing to receive this light? Are we praying with our whole hearts that it may come to us, and that we may be prepared to receive it? However great our spiritual enlightenment may be, we are still, in some measure, “sitting in darkness and in the shadow of death.” But the light is coming; already we can see the dawn upon the mountain. When Mary was born, the first ray of light tinged the eastern sky; when Jesus was born, the light of this mystic moon was as the light of the true sun, because of her perfect union with Him; and the light of the sun was sevenfold, as the light of seven days. The light was sevenfold; that is, the light was perfect, for it was the light of God.’
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Secrets to Sanctity - According to St. Francis de Sales, will give you guidance on prayer, mental prayer, most specifically. Just seek in the table of contents
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Great book:thumbsup: