The presence of the Holy Spirit in a person testifies of God, not necessarily by any spoken word, but by the evidence of a changed life.
Christ admonishes His people to prepare for difficult times by cultivating a close relationship with their Savior. Apart from Christ, we can do nothing.
The blood of Christ, a propitiation or appeasing force, the only means to satisfy God's pure sense of justice, is a testimony of God's intense love for us.
God the Father does not take the minimization of His Son's sacrifice lightly, as some Protestant theologians imply with their cheap grace doctrine.
In Israel, sins were symbolically placed on the altar throughout the year. On Yom Kippur, one goat's blood cleansed the altar; the second took away the sins.
On the Day of Atonement, the one goat's blood cleansed the altar of all the sins, while the azazel took them away. Jesus Christ fulfilled both these roles.