Grasp all, lose all. If you try to do two things at the same time, you will succeed in neither.

to try to do two things at the same time

task; (doing a) bit of work / difficult task; hard work

person

eventually, after all

lesson, teaching

to teach

to work hard and do one's best to achieve a goal / to strive unrelentingly in the face of difficulty, to persevere

conjunctive form of 頑張る (ganbaru) [godan] / do your best, good luck, keep at it, don't give up, hang in there

(imperative, exhortation) do your best, good luck, hang in there, come on, don't give up, keep going