Consider a tuning fork. It delivers a true pitch by two tines vibrating together. Muffle either side, even a little, and the note disappears. Neither tine individually produces the sweet, pure note. Only when both tines vibrate is the correct pitch heard.
2 Tim. 1:7
For God has not given us a spirit of fear and timidity, but of power, love,and self-discipline.
John 1:12
But as many as received Him, to them He gave the right to become children of God, to those who believe in His name.
Heb. 9:17
And it is appointed for men to die once, but after this the judgment.