Long is the night for the sleepless. Long is the road for the weary. Long is samsara (the cycle of continued rebirth) for the foolish, who have not recognised the true teaching.
The mentor can be identified by four things: by restraining you from wrongdoing, guiding you towards good actions, telling you what you ought to know, and showing you the path to heaven.
If you know something hurtful and not true, don't say it. If you know something hurtful and true, don't say it. If you know something helpful but not true, don't say it. If you know something helpful and true, find the right time to say it.
An pretend and evil friend is haughty to be feared than a unmanageable beast; a unmanageable beast may mouthful your build up, but an evil friend fortitude mouthful your intellect.