The lord of the 6th house in the 7th house of the horoscope

The ruler of the 6th house in the 7th house. Marital discord, an unhealthy spouse, debts because of the spouse, partnership relations constantly deteriorate. Weak health, an absence of renown, unhappiness and misfortune owing to the fact that the lord of the 6th house aspects the ascendant. (James Braha)

The lord of the 6th house in the 7th house. Disappointments in love and a dubious character in the marriage partner are to be expected. This is a traveller, a moneylender, always occupied with new commercial plans. Their marriage partner may be a sickly person, but one who acts successfully in the commercial field. (Tom Hopke)

The lord of the 6th house in the 7th house: well off, generous, respected, well known, desperate, an adventurer, constant troubles with servants and subordinates; he does not find mutual understanding with those close to him or in society, and is indifferent to other people's problems. An unhappy marriage, Putra dosha, poor health of the wife in the dasha of the lord of the 6th house. (Shri G.S. Agarwal)

BPHS 26:67. In the case where the ruler of the 6th bhava is placed in the 7th bhava, the native will be deprived of happiness in marriage, will be well known, virtuous, respected, enterprising and wealthy.

Comments: If the ruler of the 6th bhava [house] is placed in the 7th bhava, then this means that there will be no smooth relations between the native and his spouse and they will live in constant tension, quarrelling and warring. As a consequence, their married life becomes odious. With the Mesha [Aries] and Tula [Libra] Lagnas such a life is the consequence of the native's own mistakes, which cause disharmony in the relationship, because with these Lagnas the ruler of the 6th bhava also becomes the ruler of the 3rd bhava and therefore such a person will be inclined to commit hostile acts deliberately.

(“Brihat Parashara Hora Shastra”)