How would i make a part go to the mouse's position and keep going?

I don't remember how to do this, i haven't attempted any scripting in a while so, how would you make a part go where your mouse is then keep going directly where it was.

I know you can use ~~~~~~~~~~~~~~~~~ mouse.Hit.p

 but i don't know how i would make it continue going the same path.

You mean a loop? You could do this by using RunService.RenderStepped:

local RunService = game:GetService("RunService")

local SteppedConnection
SteppedConnection = RunService.RenderStepped:Connect(function()
	-- code here
end)

-- Since RenderStepped is an event, you can cancel it by using RBXScriptConnection:Disconnect()

local function DisconnectSteppedConnection()
	if SteppedConnection then 
		SteppedConnection:Disconnect()
		SteppedConnection = nil
	end
end