This is the 12794th most frequent Turkish word.
iyimserliğe
"İyimserliğe" means "to optimism" in English.
Here, 'iyimserliğe' is in the dative form, indicating the direction or target of the action, 'sığınmak', which means 'to take refuge'.
Her durumda iyimserliğe sığınmalıyız.
We must take refuge in optimism in every situation.
In this sentence, 'iyimserliğe' is in the dative case and denotes the focus of the belief, highlighted by the verb 'inanmak', which requires this case in Turkish.
Arkadaşım iyimserliğe olan inancını hiç kaybetmedi.
My friend has never lost their faith in optimism.
Here, 'iyimserliğe' is in the dative form and indicates the object of necessity with the verb phrase 'ihtiyacımız var', which literally translates as 'there is a need for us'.