You must know a good Brahmana by these indications. A Brahmana is the first-born of all creatures, the best of four castes, the father, master and teacher of all.
तदेतैर्विविधैर्लिङ्गैस्त्वं विद्यास्तं द्विजोत्तमम्। भूतानामग्रभूविप्रो वर्णश्रेष्ठः पिता गुरुः॥