en_tn_lite_do_not_use/pro/04/23.md

Keep your heart safe and guard it

Here the word "heart" represents a person's mind and thoughts. AT: "Keep your mind safe and guard your thoughts" (See: rc://en/ta/man/translate/figs-metonymy)

with all diligence

with constant and earnest effort

from it flow the springs of life

The word "it" refers to the heart, which is a metonym for the mind and thoughts. The writer speaks of a person's life as if it were a flowing spring that originates from the heart. AT: "from your thoughts comes everything you say and do" or "your thoughts determine your course of life" (See: rc://en/ta/man/translate/figs-metonymy and rc://en/ta/man/translate/figs-metaphor)