A man becomes spiritual ...

A man becomes spiritual insofar as he lives a spiritual life. He begins to see God in all things, to see His power and might in every manifestation. Always and everywhere he sees himself abiding in God and dependent on God for all things. But insofar as a man lives a bodily life, so much he does he do bodily things; He doesn't see God in anything, even in the the most wondrous manifestations of His Divine power. In all things he sees body, material, everywhere and always - "God is not before his eyes." (Ps. 35:2)
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 John of Kronstadt

Quotes from the same author

The Saviour and the Comforter, two Persons of the Godhead: the One ever saves from sins, and the Other comforts him who is saved. Their very names are taken from their deeds, and are always actually justified. He comforts! The Holy Spirit comforts the believing soul, as a mother comforts her child.
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 John of Kronstadt
The accursed one does not allow the eye of the heart to see the Lord or His saints. He darkens our heart in every way. He scatters faith, oppressing, burning and darkening us inwardly. We must look upon all such actions as illusions and falsehood, and break through this imaginary wall to the Lord, or to His Holy Mother, or His saints. As soon as you break through this wall you will be immediately saved. 'Your faith has made you whole' (Mt. 9:22).
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 John of Kronstadt
When you are in the temple, remember that you are in the living presence of the Lord God, that you stand before His face, before His eyes, in the living presence of the Mother of God, of the holy angels, and of the first-born of the Church - that is, our forefathers, the prophets, Apostles, hierarchs, martyrs, reverend Fathers, the righteous, and all the saints. Always have the remembrance and consciousness of this when you are in the temple, and stand with devotion, taking part willingly and with all your heart in the Divine service.
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 John of Kronstadt
God is nearer to us than any man at every time. He is nearer to me than my raiment, nearer than the air or light, nearer than my wife, father, mother, daughter, son, or friend. I live in Him, soul and body. I breathe in Him, think in Him, feel, consider, intend, speak, undertake, work in Him.
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 John of Kronstadt
'Hail, you who are highly favored, the Lord is with you' (Lk. 1:28)! Thus does the holy Church invoke the most holy Virgin, the Mother of God. But the Lord is also with every pious soul that believes in Him. The Lord's abiding with the Virgin Mary before she conceived the Savior is not a particularity proper to the most pure Virgin alone. The Lord is with every believing soul: 'The Lord is with you.' These words may be said to everyone who keeps the Lord's commandments.
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 John of Kronstadt