Oh but, didn't they help so many in our walk with Him?
Right, guess all too many never took to heart when the Master said ''without doubt''. But on the peace involved in that press, it must be understood, it is a war that ensues with prayer with Him, not apart, I'm sure you agree! Paul must of had that blessing early on to know us well enough to say ''I thank God I speak in tongues more that you all'' (1Cr 14:18). So since early on then, this is not something that can be schooled into us for conditioning, but always always of enablement by Him.
Yes, it is all enabled by God but can we press into it as we trust God? I believe so. Here is more of that reasoning and a couple of examples.
Rom 12:6 "We have different gifts, according to the grace given to each of us. If your gift is prophesying, then prophesy in accordance with your faith;" Ok, and since faith comes by hearing, hearing by the word (rhema) of God. if you want to increase that prophetic gift, then get to where you hear from God to bring more faith. By the way, more faith in prophecy would mean a greater and greater level of exhortation, more precise words as well, that pertain to things of greater importance.
If the baptism of the spirit with evidence in tongues is given to all believers as the AOG among others believe, then all have a chance to really plow into speaking in trongues too. Paul does says you can speak in tongues to give thanks, but it is wrong to do it because others will not understand. (I Cor 14:16). It is interesting though that Paul does say it gives thanks well enough. v17. That among other things seems proof that we have the reins as to when we speak in tongues that is not part of a service where it will be interpreted. This latter part is as the Holy Spirit wills as part of the gift various kinds of tongues, the former is I believe simply the baptism in the spirit, which should give the ability to excercise tongues by faith at any time.
I think that Paul was special in part, because he was praying the mysteries of God which is also scriptural in I Cor 14:2. Some of those mysteries were likely parts of the New Testament. At least a few modern Pentecostals teach that we too can get revelation from speaking in tongues though none can rise to the level of Paul as the canon is closed. Revelation is not closed though, and we can also speak the mysteries of God and someimes gain some understanding. So this is tongues in private, from giving thanks, to speaking the mysteries of God (And hopefully getting some understanding).
Also, Since we can pray without ceasing I Thess 5:17, it in theory is at least possible for a zealous Christian to pray hours a day in understanding but especially in tongues. Dave Roberson did that for weeks at a time for 8 or more hours a day. Few attain that in the practical world but Roberson maintained that it not only brought him revelation of God's word but also birthed in abilities that brought about creative miracles and other gifts and anointings that he ministered under. I am thinking there are a few others like that; ministers that spend much time with God and are not famous names because they do not promote themselves.
Likewise, I know a pastor that fasts over 100 days a year and has been doing that for decades. In 45 years of service to the same church, he has never once missed a scheduled sermon. I admit all this seems extreme and I am certain there are other extreme ways to really flourish in God. If anything, reading and studying the word probably brings the most fruit on an hour for hour basis but Christians certainly have opportunities to do far more in God. So at least to me God enables more than we walk into. There is no condemnation for not being radical, but our efforts are rewarded. James basically says so in "the effectual fervent prayer of a righteous man availeth much."