De Quibusdam Morbis Discipulorum
And thus, if any Babe of thine be ill at ease, look closely first whether this Love be not the Root of his Distemper. Watch also Idleness, for whoso presseth eagerly forward in Will heedeth little the Affairs of his Fellows. O my Son, if every Man doth his own Will, there is no more to say! But the Busy-body nor mindeth his own Business, nor leaveth others to mind theirs. Be thou instant therefore with such an one, to cure him by enlightening his Will, and speeding him therein. Remember also that if one speak ill of another, the Fault is first of all in himself, for we know naught but that which is within us. Did not the great Witch-Finder end by confessing that he also was a Sorcerer? We become that which obsesseth us, either through extreme Hate or Extreme Love. Knowest thou not how the one is a Symbol of the other? For this Reason, since Love is the Formula of Life, we are under Bond to assimilate (in the End) that which we fear or hate. So then we shall be wise to mould all Things within ourselves in Quietness and Modulation. But above all must we use all to our own End, adapting with Adroitness even our Weakness to the Work.
 On Certain Diseases of Disciples