Sentence:  The love within us and the love without / Are mixed, confounded; if we are loved or love, / We scarce distinguish. So, with other power. / Being acted on and acting seem the same: / In that first <WSD>onrush</WSD> of life's chariot-wheels, / We know not if the forests move or we. 
Meaning of the word marked with <WSD> tags:  A forceful rush or flow forward.