Titus 2:8; Titus 2:15; Titus 3:2; Titus 3:13

8 sound in speech which is beyond reproach, so that the opponent will be put to shame, having nothing bad to say about us.
15 These things speak and exhort and reprove with all authority. Let no one disregard you.
2 to malign no one, to be peaceable, gentle, showing every consideration for all men.
13 Diligently help Zenas the lawyer and Apollos on their way so that nothing is lacking for them.