Srimad Bhagavad-Gita :
Chapter-3. ( Karma-yogam )
Slokam-34. ( Attraction/ like & repulsion/aversion/dislike of the senses to their sense-objects ( vishaya-s ) is unavoidable ( already exists in everyone ); one should not be controlled by them; since they are enemies ( obstacles in one's path. )
Indriyasyendriyasyarthe ragha-dveshau vyavasthitau,
tayorna vasamagacchet tau hyasya paripanthinau.
indriyasya = to the five senses;
indriyasya arthe = in the sense objects (vishaya-s);
ragha-dveshau = ragha (attachment/like) in favourable, and dveshau (detachment/dislike) in unfavourable;
vyavasthitau = already existing;
tayoh = to them (Ragha and dveshau);
vasam na agacchet = should not be under (their) control;
hi tau = why because, those two (Ragha & dveshau ) ( likes & dislikes);
asya paripanthinau = (are) his (human-being's) enemies.