If we can catch a disease from certain persons, we can also catch health from others:  if some companions exhaust and depress, others equally exalt and vivify. 

A deep, true love will lift a soul out of the shallows of selfishness and the mud of fleshliness, when all other powers combined have failed to extricate it from the slough

Not by premeditated words, or ostentatious actions, but by the unconscious power of character, we mould others into the likeness of ourselves.  

And you ought not to be satisfied until you find yourself able to feel that the hope of doing something by your living to make the world in a real, although an un-appreciable, degree more full of these words for the men who are to follow us, is the noblest and most inspiring promise which can be set before your soul.