"He who does not desire the death of the sinner will never abandon him. By ways known to Him, He will lead him to the desired end" (1 Cor 1:9; 10:13; Heb 10:23).
"The Lord will fulfill His promises. Only be faithful to Him and be upright in everything required of you.
"Man is weak and changeable. But by His grace, in those who surrender themselves to Him, God knows how to bring man's wavering will into harmony with His own will.
"He fulfills in men, by their own powers, His intentions concerning them."
According to the teaching of Saint Paul, two independent substances lie at the foundation of human nature: the material, which is body or flesh, and the spiritual, which is spirit.
The first substance serves as the foundation of material human nature, of man's corruption and death (1 Cor 15:53).
The second, by contrast, is the principle of incorruption and the source of immortal life (2 Cor 3:6), the capacity for knowledge (2 Cor 4:13), self-knowledge (1 Cor 2:11), and free will (Phil 1:27).
In Saint Paul, "soul" does not designate a separate independent substance. It designates only a special power, a special side of man's spiritual substance, his spirit.
In experience, the body subordinates this side to itself and impresses upon its activity the character proper to the body.
For this reason the expressions "soulish" and "fleshly" are almost equivalent in the epistles of Saint Paul. The "soulish" man, for him, thinks according to the flesh (1 Cor 2:14; 3:1; Rom 8:4-9).
By contrast, according to Saint Paul, the spirit serves as the principle of the higher spiritual powers. These are not dependent on the body, and even have a character directly opposed to the properties of the body.