This is from a homily on prayer, written by Theophan the Recluse in 1864. The entire homily is at this website (scroll down a bit and you will see links to “Four Homilies on Prayer”. The excerpt here is from the first homily.
Let me recall a wise custom of the ancient Holy Fathers: when greeting each other, they did not ask about health or anything else, but rather about prayer, saying "How is your prayer?" The activity of prayer was considered by them to be a sign of the spiritual life, and they called it the breath of the spirit. If the body has breath, it lives; if breathing stops, life comes to an end. So it is with the spirit. If there is prayer, the soul lives; without prayer, there is no spiritual life.
However, not every act of prayer is prayer. Standing at home before your icons, or here in church, and venerating them is not yet prayer, but the "equipment" of prayer. Reading prayers either by heart or from a book, or hearing someone else read them is not yet prayer, but only a tool or method for obtaining and awakening prayer. Prayer itself is the piercing of our hearts by pious feelings towards God, one after another – feelings of humility, submission, gratitude, doxology, forgiveness, heart-felt prostration, brokenness, conformity to the will of God, etc. All of our effort should be directed so that during our prayers, these feelings and feelings like them should fill our souls, so that the heart would not be empty when the lips are reading the prayers, or when the ears hear and the body bows in prostrations, but that there would be some qualitative feeling, some striving toward God. When these feelings are present, our praying is prayer, and when they are absent, it is not yet prayer.
It seems that nothing should be simpler and more natural for us than prayer and our hearts' striving for God. But in fact it is not always like this for everyone. One must awaken and strengthen a prayerful spirit in oneself, that is one must bring up a prayerful spirit. The first means to this is to read or to hear prayers said. Pray as you should, and you will certainly awaken and strengthen the ascent of your heart to God and you will come into a spirit of prayer.
I have one of the books by Theophan the Reculse shown at that website – Kindling the Divine Spark. It’s been quite a while since I read it, but I recall that I found Theophan’s homilies to be very kind and gentle, but at the same time capable of inspiring me to a fervent determination to live my Rule to the very best of my ability for the love of God.
Lord Jesus Christ, have mercy on me.