How did the spiritual knightly orders differ from the mendicant orders of monks?

The mendicant orders did not have their own possessions and did not receive income from them. The main source of existence of such orders is donations from both the common people and from feudal lords and kings. The sphere of activity of such orders was missionary work and other religious work.

Spiritual knightly orders led an ascetic lifestyle, helped people and fought against the Saracens (and not only). In addition, such orders had land holdings, received income from them, recruited recruits into their ranks, and also did not disdain commerce.