According to Osho, leaking is the mind-driven dissipation of energy that leaves you tired, heavy, and frustrated; overflowing is spontaneous, loving sharing from inner abundance that brings delight, lightness, peace, and renewed energy. Leaking is mechanical and local; overflowing is total and unplanned. The sure test is the aftermath: leakage weakens and burdens, while overflow strengthens, unburdens, and fulfills.
Leaking drains your energy and makes you tired, while overflowing means you have so much joy and love that sharing it makes you feel lighter and stronger.