Jude reveals by praying in the Spirit we stimulate our faith in God. This intimate prayer reminds us we can rest in His all the time goodness. We can put our full confidence and trust in Him.
Paul teaches when we pray in tongues we edify ourselves. This word "edifies" in the original Greek means to build up, to repair, to restore. It also connotes the idea of promoting growth in wisdom, Grace, and blessedness. It is equivalent to recharging a battery. We are energized, recharged in our total being by praying in the Spirit.
As Paul teaches about the proper exercise of praying in tongues amongst the unlearned, he reveals a great truth. Prayer in the Spirit enables us to give thanks well. Our worship is taken to a higher dimension with tongues.