These sins in word are more harmful than many sins in deed and can stand side by side with murder.

We sin "in thought" if we have any desires contrary to love for our neighbor, when we act against the commandment of God: "Do not covet anything that belongs to your neighbor."

Sins of thought are as grave as sins of deed and word, and are strictly forbidden by Holy Scripture.

Sins by "knowledge" are those that we commit, knowing that they are forbidden by the law of God, we commit them according to our passions – out of pride, malice, laziness, and the like – and we justify ourselves with false arguments.

Those who act in this way are worthy of the same sentence that the master pronounced on his wicked and slothful servant: "Wicked servant and slothful!"

You knew that I reap where I did not sow, and I gather where I did not scatter...

cast the worthless servant into outer darkness: there will be weeping and gnashing of teeth (Matt. 25:26-30).

Sins of "ignorance" arise from the weakness of human nature.

It is very difficult to see these sins behind oneself and to protect oneself from them.

Who understands the Fall? (Psalm 18:13), says the Prophet David, that is, who can see his faults, his ignorance.

However, since these are also sins, it is possible to keep from them; And therefore he adds a prayer: cleanse me from my secrets, that is, from sins committed by me through weakness and ignorance, which are either unknown to me, or which I do not remember, or which I do not even consider as sins.

To sin "willingly" means to sin knowingly, with intent and out of malice.

The Apostle Paul speaks of these sins as follows: if we, having received the knowledge of the truth, sin willfully, then there is no more sacrifice for sins.

It is impossible for those who have apostatized from Christ and willingly rebel against Him to receive forgiveness; as the same Apostle explains, saying: "It is impossible for those who have once been enlightened, and have tasted the heavenly gift, and have become partakers of the Holy Spirit, and have tasted the good word of God, and the powers of the age to come, and have fallen away, to be renewed again by repentance; when they again crucify the Son of God in themselves and mock Him (Heb. 6:4, 5, 6).