Sentence:  This beauty, in the <WSD>blossom</WSD> of my youth, / When my first fire knew no adulterate incense, / Nor I no way to flatter, but my fondness; / [...] long did I love this lady, / Long was my travail, long my trade to win her; / With all the duty of my soul, I served her. 
Meaning of the word marked with <WSD> tags:  A blooming period or stage of development; something lovely that gives rich promise.