"Nil ego contulerim jucundo sanus amico."—Hor. Sat. v. 44.
"If thou wouldst get a friend, prove him first, and be not hasty to credit him."—Ecclesias. v. 7.
"Diu cogita, an tibi in amicitiam aliquis recipiendus sit: cum placuerit fieri, toto illum pectore admitte: tam audacter cum illo loquere, quam tecum."—Seneca, Epist. iii.
"Quid dulcius, quam habere amicum quicum omnia audeas sic loquere quam tecum."—Cic., de Amic. 6.
"The friends thou hast, and their adoption tried,
Grapple them to thy heart with hoops of steel."
"But do not dull thy palm with entertainment
Of each new-hatch'd, unfledg'd comrade."—Shakspeare, Hamlet, Act I. Sc. 3.
"Bring not every man into thy house."—Ecclesias. vi. 7.