In order to be a pious person one should show unconditional love towards everything. Believing the fact that we are not just utilizers but also contributors to this universe. If a person is not in the right path or doing bad things, we can hate the bad thing but not the person. A pious person treats everyone as equal and thyself. This beautiful sloka describes how the mind of a pious person will not be influenced by negative things.
साधोः प्रकोपितस्यापि मनो नायाति विक्रियाम्।
न हि तापयितुं शक्यं सागरांभस्तृणोल्कया॥
saadhoh prakopitasyaapi mano naayaati vikriyaam
na hi taapayitum shakyam saagaraambhastruNolkayaa
Even when instigated by others, the mind of a pious person never changes/hesitates (to take the right decision).
It is not possible to heat the water of ocean by a torch of dried grass.