点击下方单词，组成正确的英文句子( 单词数量:16 )
该句使用定语从句结构说明坚持者的内在动机。
"truly" 副词真正; 精确地，正确地; 忠实的，诚实地; 正当地
"When external pressure increases, internal motivation should be strengthened."
"The soul is the engine of life."
"In human emotions, there often exists a hidden driving force."
"Motivation is not given by others; it comes from within."
