You can know a man by the company he keeps

为您解答
这句不算是谚语，全句一般是这么说的
A man may usually be known by the books he reads as well as by the company he keeps
观其书阅其友则知其人

想了解一个人，看他读什么书，交什么朋友即可。

这个句子的关键词是company，在这里是伙伴的意思。keep在此是交结、保持的意。这句话应该是谚语，意思是：
直译：你可通过一个人交往的伙伴，了解认识他。
意译：以其友，识其人

Nothing in the world is difficult if your heart into it.世上无难事只怕有心人。 Where there is a will, there is a way. 有志者事竟成。 If you find a path with no obstacles, it probably doesn't lead anywhere. 太容易的路，可能根本就不能带你去任何地方。 Great minds have purpose, others have wishes. 杰出的人有目标，其他人只有愿望。 God helps those who help themselves.自助者天助也。

You can know a man by the company he keeps
你可以通过他所在的公司了解一个人