色欲熏心坐怀不乱
[sè yù xūn xīn zuò huái bù luàn]
The phrase means someone who has desires but still maintains self-discipline. The first part describes being enticed by material or sensual temptations ('color desire' can refer to lustful thoughts or worldly pleasures), while the second part emphasizes steadfastness and self-control even when tempted.