we define spontaneous reaction is reaction which takes place on its own without aid of any external reaction but also that endothermic reaction that absorbs energy AN EXTERNAL AID also spontaneous at higher temperature

Dear Student,

We can tell whether a reaction will be spontaneous or not even by the Gibb's free energy. 
Now, for endothermic process, ΔH is positive. Therefore, if TΔS becomes greater then ΔH, then the value of ΔG will be negative and thus, the reaction will become spontaneous. 
Therefore, various terms must be considered for telling the spontaneity of a reaction. 

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At higher temperatures the reactant molecules will have enough energy to achoeve transition state so they act as spontaneous reactions.
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