Definitions: (1) devoting (one’s time, effort, or energy) to a particular undertaking with the expectation of a worthwhile result; (2) provide or endow someone with (a particular quality or attribute)

Derivation: Latin, “to clothe”

Comment: A monetary investment does have a contractual two-way street. Some times it works out that both sides are rewarded equally.
     If you invest in someone emotionally (spouse, children, community) you are interested and supportive of their growth and welfare. But there is still an expectation that your gifts of time and love are reciprocated.
     God is invested in our well-being. It makes sense we would be willing to recognize and receive these gracious gifts (mater, mind, life, freewill, spirit, etc.) with some appreciation. God does not need a dividend. What we can contribute to the partnership is that we grow in grace.