The killers of the soul are never peaceful, because they consider that human intelligence is ultimately meant for expanding material life. Thus neglecting their real, spiritual duties, they are always in distress. They are filled with great hopes and dreams, but unfortunately these are always destroyed by the inevitable march of time.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
एत आत्महनोऽशान्ता अज्ञाने ज्ञानमानिनः । सीदन्त्यकृतकृत्या वै कालध्वस्तमनोरथाः
eta ātmahano'śāntā ajñāne jñānamāninaḥ | sīdantyakṛtakṛtyā vai kāladhvastamanorathāḥ
SB 11.5.17