I’ve read that planet in sign indicates qualities we are born with; the same planet in house represents traits we develop throughout the life.i.e. The person with this Mars in Pisces in X house initially is quite passive, mutable and accepting and gets hurt easily, he doesn’t fight but cries. But later in life this person may develop X house (capricornian) qualities: he learns how to be stable and practical, disciplined and mature etc.
or Mars in Aries in VII person, initially aggressive and very independent may become more relationship-oriented, more flexible and compromising.
This is not something we want to do this is how life modifies our energies and us.
Just wanted to share