This is why we cannot be silent, when God commands us to speak, to whom to speak, and what to speak-
I have set watchmen on your walls, O Jerusalem; They shall never hold their peace day or night. You who make mention of the LORD, do not keep silent (Isa. 62:6)
“Son of man, I have made you a watchman for the house of Israel; therefore hear a word from My mouth, and give them warning from Me: “When I say to the wicked,`You shall surely die,’ and you give him no warning, nor speak to warn the wicked from his wicked way, to save his life, that same wicked man shall die in his iniquity; but his blood I will require at your hand. “Yet, if you warn the wicked, and he does not turn from his wickedness, nor from his wicked way, he shall die in his iniquity; but you have delivered your soul. “Again, when a righteous man turns from his righteousness and commits iniquity, and I lay a stumbling block before him, he shall die; because you did not give him warning, he shall die in his sin, and his righteousness which he has done shall not be remembered; but his blood I will require at your hand. “Nevertheless if you warn the righteous man that the righteous should not sin, and he does not sin, he shall surely live because he took warning; also you will have delivered your soul.” (Ezek. 3:17-21)
If the watchman sees the sword coming and does not blow the trumpet, and the people are not warned, and the sword comes and takes any person from among them, he is taken away in his iniquity; but his blood I will require at the watchman’s hand.’ “So you, son of man: I have made you a watchman for the house of Israel; therefore you shall hear a word from My mouth and warn them for Me. “When I say to the wicked,`O wicked man, you shall surely die!’ and you do not speak to warn the wicked from his way, that wicked man shall die in his iniquity; but his blood I will require at your hand. “Nevertheless if you warn the wicked to turn from his way, and he does not turn from his way, he shall die in his iniquity; but you have delivered your soul. (Ezek. 33:6-9)
And if they won’t listen… the watchmen still must speak!
Also, I set watchmen over you, saying,`Listen to the sound of the trumpet!’ But they said,`We will not listen.’ Therefore hear, you nations, And know, O congregation, what is among them. Hear, O earth! Behold, I will certainly bring calamity on this people– The fruit of their thoughts, Because they have not heeded My words, Nor My law, but rejected it. (Jer. 6:17-19)
A lion has roared! Who will not fear? The Lord GOD has spoken! Who can but proclaim it? (Amos 3:8)
Thus, we speak.