To the reprobate world, the sound of teruw'ah represents terror and war, but to God's called-out ones it is a time to render praises of happiness and great joy.
Eternal life is to live a quality life as God lives, having developed a close relationship with God, living by faith and accepting His sovereignty over all.
The meal offering represents the second Great Commandment, love toward fellow man. Our service to others requires much grinding self-sacrifice and surrender.
The spirit of the law does not do away with the letter of the law; without the letter, there is no spirit because there is no foundation. Examples show God's will.
Peter, using the details of fulfilled prophecy, establishes the Messiahship of Jesus Christ and convicts the crowd of their culpability in His death.