'Grains' in the Bible

‘Do you not fear Me?’ says the Lord.‘Do you not tremble [in awe] in My presence?For I have placed the sand as a boundary for the sea,An eternal decree and a perpetual barrier beyond which it cannot pass.Though the waves [of the sea] toss and break, yet they cannot prevail [against the sand ordained to hold them back];Though the waves and the billows roar, yet they cannot cross over [the barrier].[Is not such a God to be feared?]

Their widows will become in my sight more numerous than the grains of sand on the seashores. At noontime I will bring a destroyer against the mothers of their young men. I will cause anguish and terror to fall suddenly upon them.