'Strengthen' in the Bible

For I long to see you so that I may share with you some spiritual gift, to strengthen and establish you;

Let each one of us [make it a practice to] please his neighbor for his good, to build him up spiritually.

Now to Him who is able to establish and strengthen you [in the faith] according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery [of the plan of salvation] which has been kept secret for long ages past,