Nor merely from anger, but altogether from all perturbation of mind, ought the exercise of prayer to be free, uttered from a spirit such as the Spirit unto whom it is sent. For a defiled spirit cannot be acknowledged by a holy Spirit,Ephesians 4:30 nor a sad by a joyful,John 17:14 Romans 14:17 nor a fettered by a free.Psalms 51:12 No one grants reception to his adversary: no one grants admittance except to his compeer.
De Oratione
Chapter 12. We Must Be Free Likewise from All Mental Perturbation
1 section
Trans. S. Thelwall, The Ante-Nicene Fathers, Volume III, 1885. Public domain.