What is a Theologian?

Mirriam Webster Dictionary simply defines theologian as "a specialist in theology." Digging deeper, it defines a specialist as a person who has special knowledge and skill relating to a particular job, area of study, etc. It defines theology as the study of religious faith, practice, and experience; especially the study of God and of God's relation to the world." Therefore, according to the dictionary, a theologian is :

"A person who has special knowledge and skill relating to the study of religious faith, practice, and experience; especially the study of God and of God's relation to the world."

In Martin Luther's 1518 Heidelberg Disputation, he wrote:

"That  person does not deserve to be called a theologian who looks upon the invisible things of God as though they were clearly perceptible I those things which have actually happened [Rom. 1:20, cf. 1 Cor 1:21-25],

"he deserves to be called a theologian, however, who comprehends the visible and manifest things of God seen through suffering and the cross.

"A theology of glory calls evil good and good evil. A theology of the cross calls the thing what it actually is."

A common saying in Lutheran circles that is often attributed to Martin Chemnitz (although I can't find a reference for it) is that theology is the art of making distinctions. This, then, means:

"A theologian is an artist at making distinctions."

C.F.W. Walther states as his third thesis in "Law and Gospel" that:

"Rightly distinguishing the Law and the Gospel is the most difficult and the highest art of... theologians."