Let none of us delude himself by supposing that honesty is always the best policy. It is not.

William Ralph Inge (1860-1954) English prelate [Dean Inge]

Speculum Animae, Part 2, “Sunday Morning,” address, Cambridge (15 Jan 1911)
    (Source)

Inge's argument is not that honesty is not the most virtuous course, but that it is not always the most secularly advantageous course, and that such disadvantage is one of the costs of maintaining Christian virtue.