'Guard' in the Bible

This is why I suffer as I do. Still, I am not ashamed; for I know Him [and I am personally acquainted with Him] whom I have believed [with absolute trust and confidence in Him and in the truth of His deity], and I am persuaded [beyond any doubt] that He is able to guard that which I have entrusted to Him until that day [when I stand before Him].

Guard [with greatest care] and keep unchanged, the treasure [that precious truth] which has been entrusted to you [that is, the good news about salvation through personal faith in Christ Jesus], through [the help of] the Holy Spirit who dwells in us.