Through the ages there is much secret prayer, there is no announcement, it did not make the books of Church history, very few know what was prayed. God hears every prayer, He notices. Every prayer, short prayers, long prayers will be heard by God.
Another great quote from Hidden Life of Prayer by David MacIntyre
… the inner sanctuary. A solitary worshipper has entered within the veil, and hushed and lowly in the presence of God, bends before the glancing Shekinah. This represents the hidden life of prayer of which the Master spoke in the familiar words, “But thou, when thou prayest, enter into thine inner chamber, and having shut thy door, pray to thy Father which is in secret, and thy Father which seeth in secret shall recompense thee” (Matt. 6:6).
“Men ought always to pray, and “-although faintness of spirit attends on prayer like a shadow-“not faint.” The soil in which the prayer of faith takes root is a life of unbroken communion with God, a life in which the windows of the soul are always open towards the City of Rest. We do not know the true potency of prayer until our hearts are so steadfastly inclined to God that our thoughts turn to Him, as by a Divine instinct, whenever they are set free from the consideration of earthly things. It has been said of Origen (in his own words) that his life was “one unceasing supplication.” By this means above all others the perfect idea of the Christian life is realized. Intercourse between the believer and his Lord ought never to be interrupted.
“The vision of God,” says Bishop Westcott, “makes life a continuous prayer.” And in that vision all fleeting things resolve themselves, and appear in relation to things unseen. In a broad use of the term, prayer is the sum of all the service that we render to God,8 so that all fulfillment of duty is, in one sense, the performance of Divine service, and the familiar saying, “Work is worship,” is justified. “I am prayer,” said a Psalmist (Psa. cix. 4). “In everything, by prayer and supplication, with thanksgiving,” said an Apostle.
This is a quote from Hidden Life of Prayer by David MacIntyre