Why is he called double-minded? According to Theophylact, such a man makes progress neither in the present life nor in the future. For in Holy Scripture the soul is called life.
For example, in the book of Job it is said: “All that a man has he will give for his soul,” that is, for his life (Job 2:4).
Saint Mitrophan understands “soul” here as the opinion of a man easily changed. But you, O Christian, cast double-mindedness entirely out of your heart.
Do not be double-minded and do not doubt when you ask something of God, saying in your thought: How can I ask anything of God, or receive according to my request, since I have sinned so much before Him?
No, do not think this way. Rather, bring your confession to God from your whole heart, return to Him, and ask Him without wavering for those things that are profitable for your salvation.
Ask with great humility and for a long time. Then you will come to know His tender compassion, because He will not forsake you, but will fulfill your requests.
For God is not resentful and does not remember the sins of those who repent. He has compassion on His creatures.
The Old Scripture speaks in agreement about the double-minded and the fainthearted, and about people with divided opinions. Thus Hosea bears witness as follows: “Their hearts are divided; now they shall perish” (Hos 10:2).
Solomon declares this: “Think of the Lord in goodness, and seek Him in simplicity of heart. For He is found by those who do not tempt Him, and He appears to those who do not disbelieve Him” (Wis 1:1-2).
Sirach says, “Do not be doubtful about the fear of the Lord, and do not come to Him with a divided heart” (Sir 1:28).
Again, he laments the double-minded, saying: “Woe to fearful hearts and weakened hands, and to the sinner who walks on two paths. Woe to the weakened heart, because it does not believe; therefore it will not be protected” (Sir 2:12-13).
Faith, as Mitrophan adduces, must unquestionably precede every request. The foundation of good things and their basis is sincere faith in God.
The divine Cyril also says: “Therefore faith is beautiful, because it provides us with the gracious power of grace. On the contrary, double-mindedness and doubt are harmful.
For ‘a double-minded man is unstable in all his ways,’ as it is written, and will receive absolutely nothing from the Lord” (Commentary on the Gospel of John, book 6).
Basil the Great also said: “Even if a month passes, or a year, three years, or a greater number of years, do not withdraw until you receive. Ask with faith, ceaselessly doing good” (Ascetical Rules, ch. 1).
And Abba Macarius says: “For he who does not quickly receive, when God delays and waits, burns still more ardently.
To the measure that the Lord Himself delays and waits, testing the faith and love of his will, to that same measure he must seek the gift of God more eagerly and carefully, without slackening and without weariness” (Series: Commentaries on Matthew).