Atoms are probalistic Our freedom is our capacity to know that we are determined

atoms, with their probabilistic paths are the only substance that exists fundamentally in us and if they are probalistic  human behaviour is fully determined, with freedom being our capacity to know that we are determined 

: ″the infant believes that it is by free will that it seeks the breast; the angry boy believes that by free will he wishes vengeance; the timid man thinks it is with free will he seeks flight; the drunkard believes that by a free command of his mind he speaks the things which when sober he wishes he had left unsaid. … All believe that they speak by a free command of the mind, whilst, in truth, they have no power to restrain the impulse which they have to speak

See Spinoza