It is of as much importance to know _what_ Paul prayed, as how frequently and earnestly he did so. Intercession is a spiritual work. Our confidence in it will depend much on our knowing that we ask according to the will of God. The more distinctly we ask heavenly things, which we feel at once God alone can bestow, which we are sure He will bestow, the more direct and urgent will our appeal be to God alone. The more impossible the things are that we seek, the more we will turn from all human work to prayer and to God alone.
In the Epistles, in addition to expressions in which he speaks of his praying, we have a number of distinct prayers in which Paul gives utterance to his heart's desire for those to whom he writes. In these we see that his first desire was always that they might be "established" in the Christian life. Much as he praised God when he heard of conversion, he knew how feeble the young converts were, and how for their establishing nothing would avail without the grace of the Spirit prayed down. If we notice some of the principal of these prayers we shall see what he asked and obtained.
Take the two prayers in Ephesians--the one for light, the other for strength. In the former (i. 15), he prays for the Spirit of wisdom to enlighten them to know what their calling was, what their inheritance, what the mighty power of God working in them. Spiritual enlightenment and knowledge was their great need, to be obtained for them by prayer. In the latter (iii. 15) he asks that the power they had been led to see in Christ might work in them, and they be strengthened with Divine might, so as to have the indwelling Christ, and the love that passeth knowledge, and the fulness of God actually come on them. These were things that could only come direct from heaven; these were things he asked and expected. If we want to learn Paul's art of intercession, we must ask nothing less for believers in our days.
Look at the prayer in Philippians (i. 9-11). There, too, it is first for spiritual knowledge; then comes a blameless life, and then a fruitful life to the glory of God. So also in the beautiful prayer in Colossians (i. 9-11). First, spiritual knowledge and understanding of God's will, then the strengthening with all might to all patience and joy.
Or take the two prayers in 1 Thessalonians (iii. 12, 13, and v. 23). The one: "God so increase your love to one another, that He may stablish your _hearts unblameable in holiness_." The other: "God _sanctify you wholly_, and preserve you blameless." The very words are so high that we hardly understand, still less believe, still less experience what they mean. Paul so lived in the heavenly world, he was so at home in the holiness and omnipotence of God and His love, that such prayers were the natural expression of what he knew God could and would do. "God stablish your hearts unblameable in holiness," "God sanctify you wholly"--the man who believes in these things and desires them, will pray for them for others. The prayers are all a proof that he seeks for them the very life of heaven upon earth. No wonder that he is not tempted to trust in any human means, but looks for it from heaven alone. Again, I say, the more we take Paul's prayers as our pattern, and make his desires our own for believers for whom we pray, the more will prayer to the God of heaven become as our daily breath.