sn The word בְּטַח (bétakh, “trust”) is used in the OT in (1) literal physical sense: to physically lean upon something for support and (2) figurative sense: to rely upon someone or something for help or protection (BDB 105 s.v. I בְּטַח; HALOT 120 s.v. I בטח). The verb is often used with false securities, people trusting in things that prove to be worthless. But here the object of the secure trust is the Lord who is a reliable object of confidence.

sn The “heart” functions as a metonymy of subject encompassing mind, emotions and will (BDB 524 s.v. לֵב 2).

tn Heb “do not lean.” The verb שָׁעַן (sha’an, “to lean; to rely”) is used in (1) literal physical sense of leaning upon something for support and (2) figurative sense of relying upon someone or something for help or protection (BDB 1043 s.v.). Here it functions figuratively (hypocatastasis: implied comparison); relying on one’s own understanding is compared to leaning on something that is unreliable for support (e.g., Isa 10:20).

tn Heb “your understanding.” The term בִּינָה (binah, “understanding”) is used elsewhere in this book of insight given by God from the instructions in Proverbs (Prov 2:3; 7:4; 8:14; 9:6, 10; 23:23). Here it refers to inherent human understanding that functions in relative ignorance unless supplemented by divine wisdom (Job 28:12–28; 39:26). The reflexive pronoun “own” is supplied in the translation to clarify this point. It is dangerous for a person to rely upon mere human wisdom (Prov 14:12; 16:25).