Parashat Teruma brings a great opportunity to talk about the topic of Tzedaka. The concept of the Merkava is that whatever we do in our lives from how do we act with ourselves to how do we treat others serves as Merkava to the Sefirot. By the use of the attributes of the Sefirot we activate the Sefira itself. For example; when a person gives charity, he hooks himself to the attribute of Chesed, therefore activating the Sefira of Chesed. 
 

A person might think that he could/should activate the right pilar from the Tree of Life (Structure of the Sefirot) all the time. But that is not what judaism preaches. Judaism is all about balance, a person should not give everything he has and also not to give anything to anyone (activating the left pilar of the spiritual structure). The great balance is within Yesod(middle pilar of the structure). When the giving is done with balance then the act is called Tzedaka.
 

In a deeper aspect, the person who is giving Tzedaka is represented by the Yesod and the poor person receiving the charity is represented by the Malchut. As in the structure Yesod provides the sustenance to the Malchut. The starting point of the Malchut is judgment since it is..