修習止觀坐禪法要 1.80

1.80

次一坐中，身息雖調，而心或浮沈寬急不定。爾時若覺，當用前法，調令中適。

Next, during a single sitting, though the body and breath are harmonized, the mind may be unsettled, with floating, sinking, laxity, or tension. If one notices it at that time, one should use the previous methods to harmonize it and make it properly balanced.