The word acquiesce comes from the Latin word quiescere, meaning "to be quiet, or to rest and find peace." The definition of acquiesce is to passively accept something or allow something to happen by not arguing against it.
How does the concept of being quiet relate to the meaning of acquiesce discussed above?
The act of being quiet tends to produce unfavorable results and empowers others.
People who remain quiet are able to find peace in whatever endeavors they choose.
Those who allow things to happen without objectioning are choosing to remain quiet.