One should not apply these labels too literally, though. Not all individuals with moon or Jupiter in Lagna are kind or gentle or even moral, necessarily. A benefic planet can be weak or strong in a horoscope and this would tend to make its 'impression' and expression weak or strong in the life of someone. Generally speaking, planets that are exalted lean towards the benefic side of their nature while those that are debilitated express the malefic end of their spectrum of expression, regardless of their inherently benefic or malefic disposition. The strength of a planet can be determined in many ways, and to some extent is a technical matter that is based partly on mathematical derivation using systems such as shadbala, etc. and are based on the placement of planets in certain sign or house and on some time-based factors, as well as the number of own or benefic divisions that the planet obtains in the various varga chart.
Beginners tend to use the 'ready-made' values that most programs generate.
Many books are also available on this somewhat advanced topic. It is good to familiarize oneself with the details of these methods and these sources of strength. A simplified system based on five factors has proved to be quite helpful as a quick primary approximation. I have published this in The Astrological Magazine in 1980 and in 1992 in a slightly modified manner in the NCGR member letter. It is discussed further on in this article.