Sentence:  But "friendſhip" is a calm and ſedate affection, conducted by reaſon and <WSD>cemented</WSD> by habit; ſpringing from long acquaintance and mutual obligations; without jealouſies or fears; and without thoſe feveriſh fits of heat and cold, which cauſe ſuch an agreeable torment in the amorous paſſion. 
Meaning of the word marked with <WSD> tags:  To make permanent.