The extent of the teacher of God's faithfulness is the measure of his advancement in the curriculum. Does he still select some aspects of his life to bring to his learning, while keeping others apart? If so, his advancement is limited, and his trust not yet firmly established.

Faithfulness is the teacher of God's trust in the Word of God to set all things right; not some, but all. Generally, his faithfulness begins by resting on just some problems, remaining carefully limited for a time. To give up all problems to one Answer is to reverse the thinking of the world entirely.
  
And that alone is faithfulness. Nothing but that really deserves the name. Yet each degree, however small, is worth achieving. Readiness, as the text notes, is not mastery.

True faithfulness, however, does not deviate. Being consistent, it is wholly honest. Being unswerving, it is full of trust. Being based on fearlessness, it is gentle. Being certain, it is joyous. And being confident, it is tolerant.

Faithfulness, then, combines in itself the other attributes of God's teachers. It implies acceptance of the Word of God and His definition of His Son. It is to Them that faithfulness in the true sense is always directed. Toward Them it looks, seeking until it finds. Defenselessness attends it naturally, and joy is its condition. And having found, it rests in quiet certainty on that alone to which all faithfulness is due.