Sirach 35: 12-17

Give to the Most High as he has given to you,
and as generously as you can afford.
For the Lord is the one who repays,
and he will repay you sevenfold.

Do not offer him a bribe, for he will not accept it;
and do not rely on a dishonest sacrifice;
for the Lord is the judge,
and with him there is no partiality. (Sirach 35:12-15)

Motivation or intention or purpose can be complicated.

The issues are often crystalized in our giving to God.

Do I give in thanks, in love, or in hope of repayment sevenfold?

Do I give to fulfill the need of the other or because giving is self-fulfilling?

Mostly we need to give more, both to address the needs of others and in thanksgiving. Worrying about intention can wait until the giving becomes truly self-sacrificing.