References – AN 4.170: In Conjunction 
“When meditation is strong, awareness automatically falls upon the object, and both melt away quickly. However, sometimes hindrances cloud the mind, and the mind wanders. Is it best to develop more concentration? I’ve been experimenting with breath sensations.” Answered by Ajahn Pasanno. [Hindrances] [Proliferation] [Concentration] [Mindfulness of breathing] // [Investigation of states]
Sutta: AN 4.170: In Conjunction.
Thanksgiving Retreat 2011, Session 4, Excerpt 6
“Is the purpose of jhāna and 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