Little minds, like weak liquors, are soonest soured. [ Proverb ]

There is no security in a good disposition if the support of good principles - that is to say, of religion, of Christian faith - be wanting. It may be soured by misfortune, it may be corrupted by wealth, it may be blighted by neediness, it may lose all its original brightness, if destitute of that support. [ Southey ]