John Chrysostom
Then, so that no one may think this is sufficient, what does he say? "Having faith and a good conscience." A teacher must first teach himself. Just as a commander, if he had not first been an excellent soldier, would never be a commander, so also is the one who teaches.
The Apostle says this elsewhere also: "Lest, after preaching to others, I myself should be disqualified" (1 Cor 9:27). "Having," he says, "faith and a good conscience," so that you may govern others in this way.
Hearing this, let us not despise the instructions of those who are greater than we are, although we are teachers. If Timothy, with whom none of us should compare ourselves, receives instruction and learns, and that when he himself was already in the rank of teacher, how much more should we.
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"Which," he says, "some, having rejected, have suffered shipwreck concerning the faith." And rightly so. For when life becomes worthy of condemnation, teaching of the same kind also arises.
One can see many who have fallen from this into the abyss of sins and gone astray into paganism. So as not to be tormented by fear of the future, they try to persuade themselves in their soul that all our threats are false.
Some turn away from faith because, through speculation, they subject everything to investigation. Speculation produces shipwreck, while faith is, in a certain sense, a secure ship.
Everywhere, beloved, we need faith. Faith is the mother of all good things, a medicine unto salvation. Without it, it is impossible to assimilate any of the lofty doctrines.
Those who try to swim across the sea without a ship may swim a little by moving hands and feet. But when they stretch farther, they are soon swallowed by the waves.
So also those who are guided only by their own reason suffer shipwreck before they have learned anything. As Paul says, some have suffered shipwreck concerning the faith.