The meaning of “ἀλήθεια”

“And they sent out unto him their disciples with the Herodians, saying, Master, we know that thou art true, and teachest the way of God in truth, neither carest thou for any man: for thou regardest not the person of men.”

“Then Peter opened his mouth, and said, Of a truth I perceive that God is no respecter of persons:”

“O foolish Galatians, who hath bewitched you, that ye should not obey the truth, before whose eyes Jesus Christ hath been evidently set forth, crucified among you?”

“That they all might be damned who believed not the truth, but had pleasure in unrighteousness.”

“For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,”