We need to look the silence of Jesus, for thirty years Jesus lived a life of silence. He was known locally solely from his work he did with his step father Joseph. During his three years of public life we see how at times he retreats in prayer, to be alone with his Father, or when he performed his miracles without fanfare.
Then their is the silence before his enemies, that is those who were against him but he still loves them during his passion. Saint Jerome comments: our Savior, because of his mercy had redeemed the world, allows himself to be led to his death like a lamb without a word of complaint or self-defiance.
We also see him silent when people yelled for Barabas or when Pilate asked "Do you not hear how many things testify against you? But Jesus gave him no answer and Pilate wondered greatly.
The silence of God in the face of human passions before the sins which are committed every day by humanity, is not a silence of anger but a silence of full patience. Christ silence during his earthly life represents interior strength and sense of purpose.
Those who complain continually about their misfortunes or bad luck should look to Lord's example or when we feel compelled to explain or excuse our actions and waiting anxiously for approval, should take not of Christ. Vanity will have us say things which should have been kept locked in the soul. Exclaimed from the prophet of Isiah, the Holy Spirit advises us that our fortitude is grounded in silence and in hope
To speak when its necessary , is with charity and fortitude , that is when we don't remain silent. There can be silence that collaborates with lying ,cowardice or of keeping comfort and fear of complicating ones life. The word of Jesus is full of authority as he faced injustice and abuse from the scribes and pharisees
"you hypocrites, For you devour widows houses and for pretense you make long prayers" Matt 23:14
Saint John the Baptist teaches us to say everything that must be said so we too may cry in the wilderness, and not worry of the consequences. If each Christian were to speak with conformity with Faith, we could change the world. We can't be silent in the face of crimes like abortion , degradation of marriage, or when someone attacks the Pope or Blessed Mother, if we are silent in these things, we could be collaborating with evil because others may see our silence with consent.
Through our Baptism we have the grace to give us courage to be silent, but when to be not silent to defend our faith, we must pray for this grace
Based From Fr, Francis Fernandez Book Chapter 45