If Mercury is in the 10th house the native will be successful by performing virtuous deeds. He will be patient, will have wide spread reputation and will be a great thinker. In his 28th year he will suffer from eye troubles. If Mercury is in his own sign or in his sign of exaltation or is in conjunction with Jupiter, the native will perform many kinds of religious rites.
If Mercury is in the house of his enemy, or is associated with a malefic, the native will be stupid, will indulge in sinful deeds and will be of bad conduct.
Mercury in 10th House means that communications or transportation will be a central part of the career. This would be a good placement for a writer, a public speaker, a salesperson, a TV or radio newscaster, or even cabdrivers and truck drivers, etc.
Other Views
Brihat Jatak- The person concerned will be happy and powerful.
Phaldeepika- The native will be learned, powerful, intelligent, happy, will perform virtuous deeds and will be successful in his life.
Saravali- The native will be highly intelligent, will perform virtuous deeds, will be successful in his life, will be educated, tolerant and powerful. He will be decorated with many honours.
Chamatkar Chintamani- The native will get paternal property. He will be respected everywhere. He will have the authority of a king. He will speak less and do more.