Spiritual Exercise
Jesus often took his apostles away by themselves for short periods to engage in meditation and prayer, but for the most part he kept them in service-contact with the multitudes. The soul of man requires spiritual exercise as well as spiritual nourishment. 91:7.2
The Spiritual World
In the physical universe we may see the divine beauty, in the intellectual world we may discern eternal truth, but the goodness of God is found only in the spiritual world of personal religious experience. 2:6.1
Romans 10:9-10
9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
10 For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.