Explaining the Misconception attributed to Jupiter harming the house it’s in and Saturn protecting the house it’s in.
जीव क्षेत्रे यदा शनिः शनि क्षेत्रे यदा जीवः।
स्थान हानि करौ जीवः स्थानवृद्धि करो शनि ।।
If Jupiter is placed in signs owned by Saturn, it harms the significations of the said house (Capricorn, is debilitation sign of Jupiter and Aquarius is the enemy sign, If Jupiter is in Aquarius this placement is adverse from its sign Sagittarius as this placement would be 3rd from the sign and 12th form its other sign the Pisces so in both the conditions it harms the interest of the house). If Saturn is placed in signs owned by Jupiter, it tends to increases the auspiciousness of those houses. If Saturn is in Sagittarius its 12th from its sign Capricorn and 11th from sign Aquarius so Saturn will give negative results for its own sign the Capricorn, so one house effect of Saturn is harmed, In Pisces, it will again be in 2nd from Aquarius and 3rd from Capricorn again adverse for Capricorn Rashi based sign. Saturn in signs of Jupiter will give results of MT sign only, as per the adage that Saturn in exaltation or representing Aquarius its MT( Mool Trikona) is more positive than negative. Another valid point of note is that if Jupiter is placed in signs owned by Saturn then Saturn becomes the dispositor of Jupiter. When Saturn is in the signs owned by Jupiter the dispositor is Jupiter the biggest benefic so Saturn benefits from this placement.
Further, if Jupiter Happens to the aspect Saturn placed in its sign then it represents the relationship of Jupiter and Saturn, Saturn will soak in the benefic influence of Jupiter entirely subject to this relationship.
Note - there are no example charts in the book as it is a reference book.