A lovely Sanskrit couplet I came across recently.
आकाशात् पतितं तोयं यथा गच्छति सागरं।
सर्व देव नमस्कारः केशवं प्रति गच्छति।।
AkAshAt patitam toyam yathA gachchati sAgaram ।
Sarva deva namaskAraH keshavam prati gachchati ।।
It says, that just like all the rain water eventually ends up in the ocean, so too all prayers to various deities eventually end up at the feet of Keshava (i.e. the One Creator, whatever you may choose to call Him).
My Guru says it is very important to have an Ishta Devata, a personal favourite deity. But no matter who you pick and pray to, this? shloka gives clarity on where the message ends up ultimately!