You cannot be proposing that the 'Virtues' necessarily come naturally to any man.
Humility is a virtue I value, but it takes concentrated effort, and continual vigilance as one progresses through life. One might be tempted to discard humility (which served one well as a neophyte) and decline into arrogance, pomposity - essentially a twat. Likewise integrity serves to build a reputation, hard to come by and easily forfeited
One is of course free to choose whichever moral framework that 'matters to you personally', that such a choice renders the obligation to those virtues 'natural', because you have chosen them omits the complexity of a moral dilemmas and trilemmas, what action to take when one's virtues 'collide', the shaping and refinement over time of one's virtues. The anguished deliberations of Socrates in the Crito - obey the Laws and be executed, or flee Athens, becoming a hypocrite to Athenians, but to himself also. Socrates' choice to take the hemlock comes only after a lengthy enquiry of which virtues mattered most, as later in the Apologia he makes clear. Socrates chooses humility, but certainly not for 'keeping up appearances'