We have come to share in Christ, if indeed we hold firmly till the end our original conviction.
NIV
For we have become fellows with Christ (the Messiah) and share in all He has for us, if only we hold our first newborn confidence and original assured expectation [in virtue of which we are believers] firm and unshaken to the end.
AMP
For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end;
KJV
Long ago I learned from your statutes that you established them to last forever.
NIV
Of old have I known Your testimonies, and for a long time, [therefore it is a thoroughly established conviction] that You have founded them forever. [Luke 21:33.]AMP
Concerning thy testimonies, I have known of old that thou hast founded them for ever.
KJV