Letters 109.13

But, to omit from discussion supreme goods or the things which produce them, wise men can none the less be mutually helpful. For the mere discovery of a sage by a sage is in itself a desirable event; since everything good is naturally dear to the good man, and for this reason one feels congenial with a good man as one feels congenial with oneself.

Seneca, Letters to Lucilius 109.13, translated by Richard Mott Gummere