Psalms 116:10

“I believed, therefore have I spoken - This, in the Septuagint and Latin Vulgate, begins a new psalm, but without any good reason. This language is borrowed by the Apostle Paul to express his confidence in the truth of the gospel, and the effect which that confidence had on him in causing him to declare the truth. 2 Corinthians 4:13. The meaning here is, that in the time of his affliction the psalmist had true faith in God; and, as a result of that, he was able now to speak as he did. At that time he trusted in God; he called on him; he sought his mercy, and God heard his prayer; and now, as the consequence of that, he was enabled to give utterance to these thoughts. Faith was at the…”

“116:10 I believed in you: Paul quotes this phrase in 2 Cor 4:13.”

“I believed: Co2 4:13; Heb 11:1 therefore: Num 14:6-9; Pro 21:28; Pe2 1:16, Pe2 1:21 I was greatly: Psa 116:3 Psalms 116:11”

“Since כּי אדבּר does not introduce anything that could become an object of belief, האמין is absolute here: to have faith, just as in Job 24:22; Job 29:24, with לא it signifies "to be without faith, i.e., to despair." But how does it now proceed? The lxx renders ἐπίστευσα, διὸ ἐλάλησα, which the apostle makes use of in Co2 4:13, without our being therefore obliged with Luther to render: I believe, therefore I speak; כי does not signify διὸ. Nevertheless כי might according to the sense be used for לכן, if it had to be rendered with Hengstenberg: "I believed, therefore I spake,hy but I was very much plagued." But this assertion does not suit this connection, and has, moreover, no support…”