The heavenly Father Whom we worship is the Father of the Truth, namely, of the only-begotten Son, and has the Spirit of Truth, the Holy Spirit, and those who worship Him in these Two do so because they believe in these Persons and act through Them. For the Apostle tells us that it is through the Spirit that we worship and pray (cf. Rom. 8:26), and God's only-begotten Son says, 'No man cometh unto the Father, but by Me' (John 14:6).
Gregory PalamasMore Gregory Palamas quotes
Let no one out of laziness or continuous worldly occupations miss these holy Sunday gatherings, which God Himself handed down to us, lest he be justly abandoned by God... If you are detained and do not attend on one occasion, make up for it the next time, bringing yourself to Christ's Church. Otherwise you may remain uncured, suffering from unbelief in your soul because of deeds or words, and failing to approach Christ's surgery to receive... holy healing.
Gregory Palamas