"No Choice I Fear" signifies that the speaker feels powerless or lacks control over their emotions when it comes to love. It suggests that despite the potential for pain, they cannot help but embrace love when it arises.
"And Love Is Hard to Measure Hidden in the Rain" conveys the idea that love's true nature and impact are elusive and difficult to quantify, much like trying to discern something hidden in a downpour. It implies that love is a complex and intricate emotion that defies easy evaluation or understanding.
In essence, this statement captures the ambivalence and mystery of love, where the anticipation of pleasure and the fear of pain coexist, and where the true essence of love remains enigmatic, often shrouded in life's uncertainties.