"A man's love, till it has been chastened and fastened by the feeling of duty which marriage brings with it, is instigated mainly by the difficulty of pursuit"

This quote by Anthony Trollope speaks to the concept that a man's love is frequently driven by the difficulty of the pursuit. Before marriage, a guy's love is frequently encouraged by the difficulty of the pursuit, as the challenge of winning over the things of his affections is frequently a source of enjoyment. After marriage, however, the feeling of task which marital relationship brings with it can act as a chastening force, securing the man's love to his partner and developing a more steady and long lasting bond. This quote suggests that the difficulty of the pursuit is a major factor in a guy's love, and that marriage can serve as a supporting force, assisting to create a more lasting bond.