Deceit; either,
1. Towards others, whom they design to deceive, and then to destroy, whilst good counsellors bring safety and joy to others. Or rather,
2. To themselves. So the sense of the verse is, They whose hearts devise mischief against others shall be deceived in their hopes, and bring that trouble upon themselves which they design against others; but they who by good counsels labour to promote the peace and happiness of others, shall reap the comfort and benefit of it to themselves.