'Strong' in the Bible

Or does it seem to you that it is for nothing that the holy Writings say, The spirit which God put into our hearts has a strong desire for us?

Be as calm in your waiting; let your hearts be strong: because the coming of the Lord is near.

Elijah was a man of flesh and blood as we are, and he made a strong prayer that there might be no rain; and there was no rain on the earth for three years and six months.