speak
The Greek word used here is "λαλέω" (laleō), which means to talk or to speak. It implies not just casual conversation but a deliberate and authoritative proclamation. In the context of the early church, where oral tradition was a primary means of communication, the act of speaking carried significant weight. Titus is instructed to use his voice to guide and instruct, emphasizing the power of spoken words in shaping belief and practice.

the things that are consistent with
This phrase suggests alignment and harmony with a standard. The Greek word "πρέπει" (prepei) conveys the idea of what is fitting or proper. In a world where various teachings and philosophies were competing for attention, Paul emphasizes the necessity for Titus to ensure that his teachings align with established truths. This highlights the importance of consistency and integrity in teaching, ensuring that what is taught is appropriate and in accordance with the faith.

sound doctrine
The term "sound" comes from the Greek "ὑγιαινούσῃ" (hygiainousē), which means healthy or wholesome. "Doctrine" is translated from "διδασκαλία" (didaskalia), meaning teaching or instruction. Together, they refer to teachings that promote spiritual health and well-being. In the early church, sound doctrine was crucial for the growth and stability of believers, protecting them from false teachings and moral decay. This phrase underscores the necessity of teaching that is not only correct but also life-giving, fostering a community that thrives in truth and righteousness.

(1) But speak thou the things which become sound doctrine.--To introduce a regular organisation and the principle of a central church government into the numerous but scattered Christian congregations in Crete was Titus' first work. The second and equally weighty mission the Apostle Paul charged him to execute was the refutation of a school of professed Christian teachers, who were promulgating doctrines at variance with the teaching of St. Paul and his brother Apostles, and were also, by their example and lives, fatally lowering the tone of Christian life. It was to the latter point--the evil moral influence of these teachers--that the attention of Titus was especially directed. False doctrinal teaching was bringing forth already its sure fruit, in the form of a life utterly unlike the pattern life of the Master. In contrast to this erroneous and misleading teaching, Titus is directed to exhort the varied ages, the different sexes, the bond and the free, to live lives which will bring no dishonour upon their Christian profession. The strictly practical nature of these charges is remarkable. Before touching upon doctrine, he presses home to these various ages and ranks the necessity of a quiet, useful life. The "sound doctrine" by which Titus was bidden to regulate his teaching is an expression peculiar to these Pastoral Epistles (see Note on 1Timothy 1:10), and stands in clear contrast to the sickly, unhealthy teaching, fanciful and false, of the misleading teachers of Crete.