In 1 Cor. 14:15, it is written,

¹⁵ What is the outcome then? I will pray with the spirit and I will pray with the mind also; I will sing with the spirit and I will sing with the mind also. ^NASB

^ΙΕʹ τί οὖν ἐστιν προσεύξομαι τῷ πνεύματι προσεύξομαι δὲ καὶ τῷ νοΐ ψαλῶ τῷ πνεύματι ψαλῶ δὲ καὶ τῷ νοΐ ^{TR, 1550}

What, if any, is the difference between praying «τῷ πνεύματι» (NASB: “with the spirit”) versus «τῷ νοΐ» (NASB: “with the mind”)? Or, is the apostle Paul using a parallelism thus equating the πνεῦμα with the νοῦς?