'Children' in the Bible

my little children, of whom again I travail in birth, till Christ may be formed in you,

for this Hagar is mount Sinai in Arabia, and doth correspond to the Jerusalem that now is, and is in servitude with her children,

for it hath been written, 'Rejoice, O barren, who art not bearing; break forth and cry, thou who art not travailing, because many are the children of the desolate -- more than of her having the husband.'

And we, brethren, as Isaac, are children of promise,

then, brethren, we are not a maid-servant's children, but the free-woman's.