Romans 14  As followers of Christ, living according to the Spirit and not according to the flesh, we are called to love.  At the end of chapter 13 Paul has told us to put on the "armor of light" and to "put on the Lord Jesus Christ".   To do this, Paul teaches, we need to look to our own consciences AND be careful to not harm anyone else's spiritual walk.  He lays out some things that we need to consider.

We are not all the same.  Some have a different "opinion" about how they must live than others.  "opinion" comes from the Greek word - dialogismos - discussion, consideration, debate, dispute, imagination, reasoning, thought ..
Paul teaches, " Let each man be fully convinced in his own mind".. regarding things like - foods we eat, or don't eat; days we observe or don't observe; what is clean or unclean.

Each of us.. who believe in Christ.. need to know that:

v3  God has accepted us.
v4 God is able to make us "stand"
v8 "we live for the Lord.. we die for the Lord; therefore whether we live or die, we are the Lord's"
v10 ".. we shall all stand before the judgement seat of God"
v12 " ... each one of us shall give account of himself to God".

We cannot judge each other's convictions, because that is between them and the Lord. v4
But, we need to be mindful of our own convictions.. "fully convinced" v5; truly thankful ( v6);
and "walking according to love" ( v15) .
We need to make our own decisions.. between us and the Lord.. keeping in mind that the "kingdom of God is not eating or drinking, but righteousness and peace and joy in the Holy Spirit". 

Our thinking and actions should then focus on:
serving Christ with His priorities in place ( righteousness, peace, and joy)
pursuing "the things which make for peace" v19
"building up .. one another" 
Being careful to not "tear down the work of God". 

We are to walk by faith.  We are to behave according to the convictions we have in relationship with our Lord.  And we are to not do anything that we have doubts about or cannot do from faith. ( v22-23)

This is one of those important lessons that we must meditate on and really think about.. for ourselves and for our opinions about others..

So Father, I pray that You will speak clearly to my heart that I might live by faith and walk"fully convinced" in regard to everything I do.  May I joyfully give thanks in every good and perfect gift that is mine in Christ Jesus.  May I never cause a brother or sister in Christ to stumble by my actions or judge them because of their beliefs.  May I serve Christ in the way that is acceptable to both Him and to others.  I ask this in the Name of Jesus, my Light.. my Savior.. and my King.  Amen.