Sentence:  But I am much pleased at the repetition of the divine favour to you in the like instances; that God hath given you another testimony of his love to your person, and care of your family ; it is an engagement to you of new degrees of duty, which you cannot but superadde to the former, because the principle is genuine and prolific, and all the emanations of grace are <WSD>univocal</WSD> and alike. 
Meaning of the word marked with <WSD> tags:  Having always the same drift or tenor; uniform; certain; regular.