Sentence:  You are asking me about the tonics, it is but natural that I want them. But I want them from your formula, of your make. Let them come in the form of affection, dedication and love; let them come in the shape of your photos. All this <WSD>tonifies</WSD> me more than all the rest, which you may desire to send. 
Meaning of the word marked with <WSD> tags:  (more generally) To invigorate; to have a restorative effect on.