'Fit' in the Bible

John answered all, saying, I indeed baptise you with water, but the mightier than I is coming, the thong of whose sandals I am not fit to unloose; he shall baptise you with the Holy Spirit and fire;

And Jesus said unto him, No man, having put his hand to the plough, and looking back, is fit for the kingdom of God.

It is neither fit for the land, nor yet for the dunghill; but men cast it out. He that hath ears to hear, let him hear.