From Teaching 41

48. If the flesh imposes itself, the material being suffers, and if the latter imposes, the spirit suffers, and truly I say to you, that this is due to the fact that no harmony exists between the two elements. The harmony exists when both form one single being and only one will.

Do not be satisfied believing that just by praying you have complied with your mission. I only ask of you five minutes of prayer so that you may dedicate the rest of the time to the struggle for your earthly existence and to comply within it the duties of your spirit, sowing, among your brethren, the seed of love and charity with your deeds.

Pray more with the spirit than with the flesh. In order to be saved, an instant of prayer or a day of love is not enough, rather a life of perseverance, of patience, of elevated deeds, of observance of My mandates.