The importance of character

According to Spurgeon, ministerial character matters:
When we say to you, my dear brethren, take care of your life, we mean be careful of even the minutiae of your character. Avoid little debts, unpunctuality, gossipping, nicknaming, petty quarrels, and all other of those little vices which fill the ointment with flies. The self-indulgences which have lowered the repute of many must not be tolerated by us. The familiarities which have laid others under suspicion, we must chastely avoid. The roughnesses which have rendered some obnoxious, and the fopperies which have made others contemptible, we must put away. We cannot afford to run great risks through little things. Our care must be to act on the rule, 'giving no offence in anything, that the ministry be not blamed.'

By this is not intended that we are to hold ourselves bound by every whim or fashion of the society in which we move. As a general rule, I hate the fashions of society, and detest conventionalities, and if I conceived it best to put my foot through a law of etiquette, I should feel gratified in having it to do. No, we are men, not slaves; and are not to relinquish our manly freedom, to be the lackeys of those who affect gentility or boast refinement. Yet, brethren, anything that verges upon the coarseness which is akin to sin, we must shun as we would a viper. The rules of Chesterfield are ridiculous to us, but not the example of Christ; and he was never coarse, low, discourteous, or indelicate.

Even in your recreations, remember that you are ministers. When you are off the parade you are still officers in the army of Christ, and as such demean yourselves. But if the lesser things must be looked after, how careful should you be in the great matters of morality, honesty, and integrity! Here the minister must not fail. His private life must ever keep good tune with his ministry, or his day will soon set with him, and the sooner he retires the better, for his continuance in his office will only dishonour the cause of God and ruin himself.

From "The Minister's Self-Watch" in Lectures to my Students