The purpose of behavior is to serve the satisfaction of bodily needs. If need-based energy accumulates unchecked over time, moti
vation arises as a sort of emergency warning system in the form of psychological anxiety that signals action needs to be taken. Once action is initiated, both bodily need and psychological anxiety are quieted.
Based on the information provided within the question it can be said that the statement is describing Sigmund Freud's Drive Theory. This theory states that behaviors, thoughts and emotions are all motivated by two basic drives, which would be sex and aggression. Stating that it until these drives are taken care of it creates psychological anxiety that motivates for these actions to occur.
