居心叵测的是人心沁人心脾的是毒蝎
[jū xīn pŏ cè de shì rén xīn qìn rén xīn pí de shì dú xiē]
The first part, 'Uncertainty of Others’ Motives,' implies unpredictability or distrust in other people's intentions; 'What Seeps into the Heart is Venom' describes the insidious effect harmful words or deeds have on someone's emotional health, like poison entering one's heart.