'Thinking' in the Bible

When one told me, saying, Behold, Saul is dead, thinking to have brought good tidings, I took hold of him, and slew him in Ziklag, who thought that I would have given him a reward for his tidings:

And the king and his men went to Jerusalem unto the Jebusites, the inhabitants of the land: which spake unto David, saying, Except thou take away the blind and the lame, thou shalt not come in hither: thinking, David cannot come in hither.

So then, let not my lord the king set his heart on this matter, thinking, 'All the sons of the king [are] dead,' for only Amnon alone [is] dead."