William Burkitt on Luke 12:8

Note here,

1. That not to confess Christ, is in his account to deny him, and to be ashamed of him.

2. That whosoever shall deny or be ashamed of Christ, either in his person, in his gospel, or in his members, for any fear or favor of man, shall with shame be disowned, and eternally rejected by him at the dreadful judgment of the great day.

Christ may be denied three ways: doctrinally, by an erroneous and heretical judgment; verbally, by oral expressions; vitally, by a wicked and unholy life: but woe to that soul that denies Christ any of these ways!