The lord of the 6th house in the 10th house of the horoscope

The ruler of the 6th house in the 10th house. The lord of a house of artha in another house of artha gives a good ability to earn money, but wealth comes slowly and after hard work, since the 6th house is a dusthana. A career in medicine, difficulty in settling on a career or a dharma, changes of career, enemies harm the career, or there will be halts in promotion at work. (James Braha)

The lord of the 6th house in the 10th house. An inability to obtain the fruits of his labour, or a protracted low position in some field. This person may have a sinful nature inclined towards destruction, and will feign religiousness for the sake of achieving some egoistic aims. He is troubled by numerous enemies. (Tom Hopke)

The lord of the 6th house in the 10th house: a gift of eloquence, a happy life abroad, a medical profession, lawsuits over the division of the father's property, disrespect towards the father. (Shri G.S. Agarwal)

BPHS 26:70. If the ruler of the 6th bhava occupies the 10th bhava, the native will be well known in his family (in his own circle), he will not be a devoted son <he will not be respectful towards his father>, will be a gifted orator and will be happy in foreign countries.

Comments: The 6th bhava [house] is the bhava representing chemistry, enemies, quarrels and struggle, and illnesses. Therefore the connection of the 6th and 10th bhavas will make the native study chemistry, military science, law, medicine and the like and will give him a profession connected with these disciplines.

(“Brihat Parashara Hora Shastra”)