Balasutta
“Chahi, bhikkhave, dhammehi samannāgato bhikkhu abhabbo samādhismiṁ balataṁ pāpuṇituṁ. Katamehi chahi? Idha, bhikkhave, bhikkhu na samādhissa samāpattikusalo hoti, na samādhissa ṭhitikusalo hoti, na samādhissa vuṭṭhānakusalo hoti, asakkaccakārī ca hoti, asātaccakārī ca, asappāyakārī ca. Imehi kho, bhikkhave, chahi dhammehi samannāgato bhikkhu abhabbo samādhismiṁ balataṁ pāpuṇituṁ.
Strength
“Mendicants, a mendicant who has six qualities can’t attain strength in immersion. What six? It’s when a mendicant is not skilled in entering immersion, skilled in remaining in immersion, or skilled in emerging from immersion. And they don’t practice carefully and persistently, and they don’t do what’s suitable. A mendicant who possesses these six qualities can’t attain strength in immersion.