What is the meaning of 两条腿走路？ 要用两条腿走路

I think this saying comes from 周恩来 or is it older? I presume it means 'do 2 things at the same time'. I just think, it's hard to walk anywhere on 1 leg! Maybe it had a deeper meaning in the time of the 大跃进?

Edit: More context: the subject is 剪纸的发展： 我以为可以两条腿走路：一面抓好继承，一面去抓发展。
要用两条腿走路


Metaphorically, it means we should be developing with two aspects and only focusing on one could not go very far. This sentence is used when the developing can be identified as two key aspects. And it won't be used if there are many aspects, because one only has two legs. For example,  我们要用两条腿走路，生产和质量都要做好，...