From Nagarjuna's Treatise on the Great Perfection of Wisdom
(Dharmamitra Translation)

Then again, to succeed in completing any endeavor is also referred to as "reaching to the other shore." (In the common parlance of India, whenever one takes up a task and then completes it, it is referred to as "reaching the other shore.")

Additionally, [one may say that] "this shore" refers to being miserly, dana refers to being in the midst of the river, and "the other shore" refers to the buddha way.

Also, [one may say that] holding a view which insists on "existence" or "nonexistence" is what is meant by "this shore." The wisdom which refutes views insisting on "existence" or "nonexistence" constitutes "the other shore" whereas the diligent cultivation of giving corresponds to being in the middle of the river.

Then again, [one may also say that] there are two kinds of dana, the first being the dana of demons and the second being the dana of the buddhas. If [in the practice of giving] one is being robbed by the thieves of the fetters such that one is afflicted by worries and abides in fearfulness, this constitutes the dana of the demons and exemplifies what is meant by "this shore."

Where there is pure giving in which there is an absence of the thieves of the fetters and in which there is nothing of which one is fearful, one succeeds thereby in arriving at the buddha way. This constitutes the dana of the buddhas and exemplifies what is meant by "reaching to the other shore." This is "paramita."
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If in giving there exist the three obstructions of an "I" who gives, an "other" who receives and a valuable object which is given, then one falls into a demonic mental state wherein one has not yet left behind multiple difficulties. In the case of giving as performed by the bodhisattva, it is characterized by three kinds of purity in which there is an absence of these three obstructions and in which one has succeeded in reaching to the other shore. It is such as is praised by the buddhas. This is what is meant by dana paramita. On account of this it is referred to as having reached the other shore. These six paramitas are able to cause a person to cross over the great sea of miserliness, over the other afflictions and beyond defiled attachment so that one reaches to the other shore. It is for this reason that they are referred to as "paramitas."