Theophylact of Bulgaria
Some understand this with the words transposed: "I will also be diligent after my departure to keep you always in remembrance." That is, to remember you daily and without ceasing.
From this they draw the thought that the saints, even after death, remember those who remain here and pray for the living.
Those who invoke the divine grace of the saints perceive the truth of this every day.
Some understand it in this way, but others understand it differently. The latter read and understand this verse simply: "I will be diligent so that after my departure you may always remember these things."
Read more (50 words)
That is, we continually repeat the same things to you in order to make them habitual for you. Through constant and unchanging assimilation of this, you will be delivered from the accusation of disobedience and ignorance.
Even after my death, you will keep the testament concerning this firmly and unchanged.