The etymology of the word vote is in Latin votum, vow - a solemn promise or assertion: one by which a person is bound to an act, service, or condition and wish. (Merriam-Webster Dictionary)
To vote is to speak out our values, our beliefs, our hopes.
To vote is to place our confidence on somebody, who will carry our values, beliefs and hopes - and act on them. With a vote we provide a mandate for a course of action. Something to be done on our behalf.
The vote is our voice.