Man has such powers, that he can transmit good or evil to his environment. These are very delicate matters. They require great care.
We must see everything in a good manner. We should not think anything evil about others. And even a glance and a sigh can effect our fellow man. And the slightest indignation brings evil. Let us have goodness and love within out soul, let us transmit these.
Let us pray that we not be indignant towards men who hurt us. Only let us pray for them with love. Whatever our fellow man does, let us not think evil of him. Always let us pray lovingly. Always let us think of the good.
We must never think regarding the other that God will give them some evil or punish them for their sin. This thought brings a very great evil, without us perceiving it.
Many times we are indignant, and we say to the other: "Do you not fear the righteousness of God, do you not fear that He will punish you?"
Other times we further say: "God cannot even punish you for that which you have done", or, "My God, do not do evil to that man for that which he did to me", or, "May he not suffer the same lot".
In all of these cases, we have deep within us the desire that the other be punished. Instead, however, of confessing our anger at their offense, we use another way of showing our indignation, appearing to entreat God for him. Thus, however, in reality we are cursing our brother.
And if, instead of praying, we say: "may you find it from God, that God might repay you for the evil you have done", then again we are praying for God to punish him.
Furthermore, when we say: "regardless, God sees everything", the state of our soul works in a mysterious way to bother the soul of our fellow man and he suffers evil. Do you understand, therefore, how our evil thoughts, our evil disposition bothers others? Because of these, we must find the way to purify the depth of ourselves from every evil. When our soul is sanctified, it shines with goodness. We silently sent out our love without saying words.
Christ never wants evil. Instead, He commands: "Bless those who curse you..."
(amateur translation of Greek text from source)