Thus holding fast to the good and keeping away from every evil thing, or, what is the same, turning away from evil and doing good (1 Pet 3:11), are two operations of one living Christian principle.
They are always inseparable, like the two feet of one who follows the Lord along the path of His holy commandments.
"Hold fast what is good." Receive the good you have recognized into your heart, embrace it with love, and hold it not once only, but throughout your whole life, as the unchanging rule of your activity.
"Keep away from every evil thing," "not from this or that only, but from every evil" (Chrysostom).
From the Greek, it means from every form of evil, that is, from evil in words, deeds, thoughts, and feelings. It means even from every shadow and slight trace of evil.
The will of God is the norm. Nothing contrary to it should be admitted under any circumstance.
Whenever perplexity arises, it is better to leave a matter undone than to do something doubtful. Then the consciousness of fulfilling the exact will of God before the face of the all-seeing God remains clear.
The word "keep away" is remarkable. It makes one picture a man walking the path of the Lord's commandments as one passing among thorns or thick, clinging grass.
At every step they hinder the free movement of his feet. Before moving from one foot to the other, he must clear the road by pushing aside the clinging grass or the hooked thorn.
This comparison shows that in one who is zealous for pleasing God and for salvation, an evil thought, and sometimes an attraction, arises against every good undertaking.
These come from a passionate heart not yet purified. In carrying out the good, one cannot avoid struggling with them.
They must be despised, rejected, and hated. In this way one pushes them away, so as to hold more freely to the good.
Here there is an allusion to what Saint Paul writes in Romans: "I find then a law, that when I would do good, evil is present with me.
"For I delight in the law of God according to the inward man, but I see another law in my members, warring against the law of my mind and bringing me into captivity to the law of sin in my members" (Rom 7:21-23).
Thus the man burning in spirit and strengthened by God's grace now turns himself away from evil, now bends himself toward the good.
Resistance to evil and compulsion of oneself toward good are his two constant occupations. They become easier as the passions grow weak and as he advances in the good.
The goal of his striving is to reach the point where, in the whole composition of his nature, the good alone reigns.