Should one say that it is impossible for him to give in that his wife should observe Kisui HaRosh with a kerchief or a sheitel (wig), and it makes no difference to him that by doing so he is placing in jeopardy his fortune and the fortune of his partner in a life partnership of many decades, then this person lacks any feeling of responsibility, duty and obligation.

Nor does this person possess the proper measure and knowledge of the meaning of a shared life, and how much it is worthwhile foregoing even more important matters, as long as it leads to a united, fortunate and happy life.

And as stated above, such a life is impossible to achieve for a Jewish man and woman unless it is lived in accordance with the Torah and Mitzvos.

Excerpt from Igros Kodesh, Vol. IX, p. 112