成唯識論掌中樞要 2.126

2.126

「有勢」等句無文解釋。「勢」謂威勢；「勤」謂策勵；「勇」謂勇銳；「堅猛」謂固進；「不捨善軛」謂永不屈及不止。

The phrases 'having force' and so forth have no text explaining them. 'Force' means power and influence; 'effort' means urging on; 'courage' means boldness and sharp resolve; 'firm and fierce' means unyielding advancement; 'not relinquishing the wholesome yoke' means never yielding and never halting.