"Let this mind be in you, which was also in Christ Jesus: ⁶Who, being in the form of God, thought it not robbery to be equal with God: ⁷But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men: ⁸And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross." Philippians 2:5-8 KJV

  "For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people:" Hebrews 8:10 

I heard from one version of the Bible that stated  let this "attitude" be in you, others say" mindset". To me this has a  deeper meaning than just an attitude.  It is His character that we are to have set in our minds, or our hearts, to think, to act, or to be like Him, to assimilate!