St. Isaac the Syrian
[The Sebastian Brock translation of Homily 64]
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"Truth is the foundation of everything that has been created. Let truth be also the foundation of all your works (both inward and outward), and especially the foundation of your prayers. Let all your life, all your works, all your thoughts, and all your desires be founded upon truth."
St. John of Kronstadt
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"True prayer is undistracted, prolonged, performed with a contrite heart an alert intellect. The vehicle of prayer is everywhere humility, and prayer is a manifestation of humility. For being conscious of our own weakness, we invoke the power of God."
St. Nectarios of Aegina
"Modern Orthodox Saints, St. Nectarios of Aegina", Dr. Constantine Cavarnos, Institute for Byzantine and Modern Greek Studies, Belmont, Massachusetts., 1981., pp. 154-187