John Chrysostom (attributed)

But all cannot obtain it, because all do not desire to obtain it. The prize is before them; he who desires the honour will not consider the toil. None would ever vanquish, if all shunned the struggle. Because then some have fallen from their purpose of continence, we ought not therefore to faint from that virtue; for they that fall in the battle do not slay the rest. That He says therefore, Save they to whom it is given, shews that unless we receive the aid of grace, we have not strength. But this aid of grace is not denied to such as seek it, for the Lord says above, Ask, and ye shall receive.