Why is it necessary to pray at home, and to attend divine service at the Church? Well, why is it necessary for you to eat and drink, to take exercise, or to work, every day? In order to support the life of the body and strengthen it. So also it is absolutely necessary to pray in order to support the life of the soul, to strengthen the soul, which is sick with sin, and to cleanse it, just as you employ some kinds of food and drink to cleanse the body.
If you do not pray, you behave inadvisedly and most unwisely, supporting, gratifying and strengthening your body in every way, but neglecting your soul.
Our soul, as a spiritual, active being, cannot remain idle; it either does good or evil, one of the two; either wheat grows in it or tares. But as every good comes from God, and as the means of obtaining every good from God is prayer, those who pray fervently, sincerely, from the depths of their hearts, obtain from the Lord grace to do good, and, before all, the grace of faith; whilst those who do not pray, naturally remain without these spiritual gifts, voluntarily depriving themselves of them by their own negligence and spiritual coldness.
And as the wheat of good thoughts, inclinations, intentions, and works grows in the hearts of those who labour and pray fervently to the Lord, so in the hearts of those who do not pray, the tares of every evil grow, smothering the small amount of good that has remained in them from the grace of baptism, chrism, and subsequent penitence and communion.
We must by every means implant in the field of our heart the seeds of the virtues, faith, hope in God, and love for God and our neighbor, fertilize it with prayer, patience, good works, and not for a single hour remain in complete idleness and inactivity, for in times of idleness and inactivity the enemy zealously sows his tares. ‘While men slept, the enemy came and sowed tares among the wheat and went his way’ (Mt. 13:25).”
We must carefully tend the field of our heart, lest the tares of every vice should grow in it; we must daily weed it – at least by morning and evening prayers – and water it with abundant tears, as with rain.
It is good for me to draw near to God, said David, who had tasted the sweetness of prayer and praising God. Other men confirm this, and I a sinner also. Observe, that to draw near to God is a good and blessed thing (even here on earth) while we are yet in the sinful flesh. What bliss, then, will it be to be united to God there in heaven! And the bliss of union with God here on earth is a specimen and pledge of the bliss of union with God after death, in eternity.
St. John of Kronstadt (1829 – 1908), Spiritual Counsels.