It is necessary to rouse the heart to pray, otherwise it will become quite dry. The attributes of prayer must be: love of God, sincerity, and simplicity.
...people mostly pray as if there were no God with them, or as if He did not heed their prayers. Let us ascribe to the Lord at least the same amount of attention that good parents show to the requests of their children, at least that provident and attentive love which good parents have for their children.
When you are praying alone, and your spirit is dejected, and you are wearied and oppressed by your loneliness, remember then, as always, that God the Trinity looks upon you with eyes brighter than the sun; also all the angels, your own Guardian Angel, and all the Saints of God.
The enemy of our salvation especially strives to draw our heart and mind away from God when we are about to serve Him, and endeavours to adulterously attach our heart to something irrelevant. Be always, every moment, with God, especially when you pray to Him. If you are inconstant, you will fall away from life, and will cast yourself into sorrow and straitness.