3 And that we may not distress you at all, I would now (only) briefly remind you of these things, because it is not becoming in a man to forget, when more at ease, the pains he experienced in tribulation; lest, like an unthankful and forgetful person, he should be excluded from the divine assembly. For at no time should a man freely praise God, more than when he has passed through afflictions; nor, again, should he at any time give thanks more than when he finds rest from toil and temptations.
As Hezekiah, when the Assyrians perished, praised the Lord, and, gave thanks, saying, 'The Lord is my salvation; and I will not cease to bless You with harp all the days of my life, before the house of the Lord.' And those valiant and blessed three who were tried in Babylon, Hananiah, Mishael, and Azariah, when they were in safety and the fire became to them as dew, gave thanks, praising and 'saying words of glory to God. ' I too like them have written, my brethren, having these things in mind; for even in our time, God has made possible those things which are impossible to men.
And those things which could not be accomplished by man, the Lord has shown to be easy of accomplishment, by bringing us to you. For He does not give us as a prey to those who seek to swallow us up. For it is not so much us, as the Church, and the faith and godliness which they planned to overwhelm with wickedness.
Source: Letters (New Advent)