Indeed, everything you say must be true, but it is not right to say everything true. If on occasion it is damaging, then be silent. But there is no fatwa for lying. Everything you say must be the truth, but you do not have the right to say everything that is true. Because if it is not sincere, it will have a detrimental effect and truth will be spent on wrong.
What I am certain of from my experience of social life and have learnt from my lifetime of study is the following:
The thing most worthy of love is love, and that most deserving of enmity is enmity. That is, love and loving, which render man’s social life secure and lead to happiness are most worthy of love and being loved. Enmity and hostility are ugly and damaging, have overturned man’s social life, and more than anything deserve loathing and enmity and to be shunned. Since this truth has been clearly explained in the TwentySecond Letter of the Risale-i Nur, here we shall point it out only briefly. It is as follows:
The time for enmity and hostility has finished. Two world wars have shown how evil, destructive, and what an awesome wrong is enmity. It has become clear that there is no benefit in it at all. In which case, on condition they are not aggressive, do not let the evils of our enemies attract your enmity. Hell and Divine punishment are enough for them.