In the second letter of Apostle Paul to the Corinthians in chapter 9, he has this friendly encouragement and appeal to their Christian charity and giving concerning the ministry for the saints. He told them about his discussion with the Macedonians in which he did some boasting about the Corinthians about their ministry for the saints and the zeal they have for the service.
 In preparing them for the gift that he intended to pick up from them and urge their preparation properly he gave them some exhortation on giving and how it should be done. 
In 2 Cor. 9:7(ESV) he said: “Each one must give as he has decided in his heart, not reluctantly or under compulsion, for God loves a cheerful giver.”
This is instructive in its setup and it is a refreshing breeze in the heat of overzealous demand and arm-twisting for giving that has drowned it out today.

The type of giving that is encouraged is one that is due to a willingness to do a good work cheerfully based on a prior decision the giver has determined. 
The common discussion is about how you have to give percentages of gross and net and how often it should be done and a lot of the associated stories about those who have “obeyed” and received the blessings.
When we come to God, before we come to God he knows everything about us and still he gives us the opportunity to come to him with our gifts for the ministry cheerfully. We ought to go to him cheerfully and pre-determining before going and before giving already resolved on what we want to give. 
We go to him giving out of a heart of gratitude and not out of a heart of business transaction. We give because we are thankful and acknowledge that he has distributed freely (2 Cor. 9:9) and that in doing so we are not only supplying the needs of the saints but as an opportunity to overflow in many thanksgiving.
Now Luke 6:38 is a favorite of those who encourage others to give as a business transaction, a tit-for-tat type arrangement and they say to their listeners “Give for it shall be given unto you. What you give to God, he will give back to you in good measure pressed down, shaken together, running over. God is challenging you to give to him.”
While the text does indeed read that way, the text does not exist in isolation, it is a part of the discourse the Lord was having with the people listening to him. In its context, it becomes clear what is being communicated.
The section starts with judging others, then to condemning, then to forgiving and finally giving. The first three obviously show a relationship between people as the idea of judging, condemning and forgiving are not emotions we can express towards God or positions we can be when we consider God. It is, therefore, logical to see that the next word which though can be used of a posture towards God, should primarily be seen as the previous three, a position before man as a part of our relationship with one another.
The section of the text from vs 37 to 42 points to the relationship between people. After the clear-cut instructions, the Lord speaks a parable which is filled with questions. The questions are as stated below:
1. Can a blind man lead the blind?
2. Can you remove a speck from your brother’s eyes if you can’t remove the log of wood in your own eyes?
3. Is the disciple above his teacher?
To each question or statement, the Lord gave answers and each point at the relationship between people.
In verses 37 & 38, the Lord was stating certain obvious truths which are judgement leads to judgment, condemnation leads to condemnation, forgiveness leads to forgiveness and giving leads to giving. Simply put, our attitudes and action bring the same back towards us. If the section before verse 37 is considered, then the continuation of the discussion of loving enemies is this section of focus. When we love our enemies and do good to those who have offended us and do not condemn them or judge them but forgive and give unto them, we fulfill this law of God.

So when next we see an opportunity to give, let 2 Cor 9:7 be the motivation and not the misreading of Luke 6:38.
Please plan to give, determine to give and give out of the abundance of all that the Lord has given to you.