References – AN 4.170: In Conjunction 
“Is the purpose of jhāna aand meditation to build up the strength of the mind so we will be able to contemplate the Four Noble Truths?” Answered by Ajahn Pasanno. [Meditation] [Heart/mind] [Four Noble Truths] [Jhāna] // [Calming meditation] [Insight meditation]
Sutta: AN 4.170: In Conjunction