Luke 1:4

NIV: so that you may know the certainty of the things you have been taught.

NAS: so that you may know the exact truth about the things you have been taught.

KJV: That thou mightest know the certainty of those things, wherein thou hast been instructed.

GWT: In this way you will know that what you've been told is true.

ASV: that thou mightest know the certainty concerning the things wherein thou wast instructed.

BBE: So that you might have certain knowledge of those things about which you were given teaching.

DBY: that thou mightest know the certainty of those things in which thou hast been instructed.

DRB: That thou mayest know the verity of those words in which thou hast been instructed.

WBS: That thou mayest know the certainty of those things in which thou hast been instructed.

WEB: that you might know the certainty concerning the things in which you were instructed.

YLT: that thou mayest know the certainty of the things wherein thou wast instructed.