St. Symeon the New Theologian writes,

"The Saints — those who appear from generation to generation, from time to time, following the Saints who preceded them — become linked with their predecessors through obedience to the divine commandments, and endowed with divine grace, become filled with the same light. In such a sequence all of them together form a kind of golden chain, each Saint being a separate link in this chain, joined to the first by faith, right actions and love; a chain which has its strength in God and can hardly be broken. A man who does not express a desire to link himself to the latest of the saints (in time) in all love and humility owing to a certain distrust in himself, will never be linked to the preceding saints and will not be admitted to their succession, even though he thinks he possesses all possible faith and love for God and for all His saints. He will be cast out of their midst, as one who refused to take humbly the place allotted to him by God before all time, and to link himself to that latest saint (in time) as God had disposed."

From "Practical and Theological Precepts" #157 and #158 (Writings From the Philokalia: On the Prayer of the Heart , pg. 135).