The dog gnaws the bone
because he cannot swallow it

When a job, task or problem is too great the thing to do is to break it down to its component parts and deal with them bit by bit.
      «Don’t bite off (не откусывай) more than you can chew (можешь прожевать)«.

      «Many a mickle maks a muckle.» - it means: A lot of littles make a large.

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Are there any difficult problems in your life? You want to leave off smoking for example? Don’t try to do it at once. Don’t try to say the last word. Break your problem down to its parts and then you’ll be able to cope with it.

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Капля точит камень не силой, но частотой падения
A rugged stone grows smooth from hand to hand.

      Капля камень точит.
      Точит.
      Точит.
      Не выдержал. Отполз влево.
      Под другую каплю.

                 Наталья Мурзина

The dog gnaws the bone
because he cannot swallow it