1 Corinthians 2:2
 For I determined not to know anything among you except Jesus Christ and Him crucified.

Paul was, to say the least, a brilliant theologian. his knowledge of the Old Testament was surpassed by none and his intellectual understanding of The Lord has been challenged only by fools. He was ministered to by Christ Jesus Himself for three years in the Persian wilderness and lived his life as a sacrifice to The Lord. Take that in comparison with myself and if I had any inclination to boast in any amount of scriptural knowledge, that has been cast far away. If we as Christians are here as Jesus' hands and feet what business should we be about other than professing the Gospel which is the life, death, and resurrection of Jesus? That is what is going to save lives and create disciples. Not some earthly wisdom. It is the cross that has saved me and it should be the cross that I profess without shame.
Application: I would rather not witness than for my motives in doing so to be myself being exalted. It is all for His glory.

1 Corinthians 3:16
Do you not know that you are the temple of God and that the Spirit of God dwells in you?

Those who are Christians have indeed made themselves a dwelling place for the Holy Spirit. A dwelling place for a part of the triune Godhead. The Holy Spirit is God and as such, is perfect. He possesses all of the attributes of God and is the part of the Godhead that we interact with most. As He is a person, He has emotions and we indeed have the ability to Greave Him. We can choose to live our lives obeying His convictions, or we can ignore them. Though we may be in disobedience, His presence will never leave us, but it will grow faint to our own perception. We can ignore Him to the point where we no longer feel His disagreement of our sin and thus we backslide in our relationship with Him. This is most definitely not a desired outcome for any genuine Christian and steps must be taken to reverse this process, but how? We are a metaphorical temple of God. Just like the Israelite temples were to be pure and clean, so shall we keep ourselves pure of sin. When we have sinned against God, we shall confess it and it will be no longer a blemish. The Lord will move in and restore all that is lost and we will once again be sensitive to His Spirit.
Application: Confess certain sins and turn from them.